DESC:FIELD OF THE INVENTION:
The present invention relates to a system for multi-level disinfection of air flowing through a
light fixture. More particularly, the present invention relates to a system that enables disinfection of air flowing at different levels in the light fixture, i.e. at a level of air entry, at
further level(s) when air is flowing inside the light fixture, and at a still further level when air is exiting the light fixture.

BACKGROUND OF THE INVENTION:
It is becoming increasingly important to disinfect the air in enclosed areas such as office spaces,
enclosed rooms in homes, public places such as airports, restaurants, cafes, foyers, schools,
colleges, toilets, etc. Microbes such as bacteria, virus, fungi, grow in moist and cool environment
offered by enclosed spaces and breed multiple times every few minutes. Hence, frequent
disinfection and purification of air is required, but it is impractical.

There have been multiple inventions relating to air purification through air conditioners and air
coolers. However, in the absence of using such appliances there are very few or no options to
optimally purify and efficiently disinfect the air. Light fixtures are inevitable devices used in all
enclosed areas. Considering the same, it becomes very useful to have a disinfecting system
integrated into such light fixtures.

The prior art discloses various attempts for disinfecting air flowing through light fixture devices.
Some systems make use of a microfine net which enables filtration of the microorganisms.
Nonetheless, the microfine net only filters the microorganisms and does not destroy them
completely. Even if the highest level of filtration is achieved by the microfine net, still a
possibility of some microorganisms or microbes from escaping out along with the cooled air
cannot be disregarded.

Many efforts have been made in the prior art towards evolving various products related to systems
for disinfecting air flowing through devices. However, it fails to disclose an assured manner of
disinfecting air as well as illuminating an area simultaneously.

Many attempts have been made to use UVC as a means of disinfection, however it has been found
to be limiting to use UVC as a disinfecting means in the presence of users. Therefore, an effective and simultaneous process has not been successfully achieved.

US20070053188A1 provides a light fixture and lighting system for a transportation vehicle that
provides color variations for lighting the passenger cabin airplane, train, bus or other type of
transportation vehicle. The lighting fixture and system further provide ultraviolet light that helps
to disinfect the circulating air in the passenger cabin. A fixture in an exemplary lighting system
provides visible light for lighting up the passenger cabin and germicidal ultraviolet light directed
toward or into an output vent(s) of the air circulation system of the passenger vehicle. The
ultraviolet light is segregated from the visible light such that ultraviolet light is only directed
toward or into the circulation vents of the vehicle's air circulation system.

Moreover, there is a need to overcome at least one of the problems mentioned above, particularly
the need for an air disinfecting system, which can destroy the microorganisms that are present in
air.

SUMMARY OF THE PRESENT INVENTION:
Before the present formulation and process, is described, it is to be understood that this
application is not limited to the particular disclosure, and details described, as there can be
multiple possible embodiments which are not expressly illustrated in the present disclosure. It is
also to be understood that the terminology used in the description is for the purpose of describing
the particular versions or embodiments only and is not intended to limit the scope of the present
application. This summary is provided to introduce concepts related to a multi-stage air
disinfecting light fixture and is further described below in the detailed description. This summary
is not intended to identify essential features of the subject matter nor is it intended for use in
limiting the scope of the subject matter.

An aspect of the present invention is to provide a disinfecting light fixture with a multi-stage
air disinfection system containing:
a. A housing compartment;
b. At least one UVC source; and

c. At least a light source in the visible wavelength region.

Wherein the housing compartment has at least:

i. an internally structured air pathway (01);
ii. air inlet (02) connected to a suction fan (04) and a pre-filter (06);
iii. air outlet (03) connected to an exhaust fan (05) and a post-filter (07);
Yet another aspect of the present invention relates to a housing compartment wherein the housing
compartment has a sandwiched filter structure comprising:

i. Nano-Silver impregnated activated carbon sponge sandwiched between two silver treated
dust mesh; and
ii. a non-woven fabric coated with TiO2.

Yet another aspect of the present invention relates to a disinfecting light fixture wherein the
internal structured air pathway directs the time and direction taken by air to travel through the
light fixture.
Yet another aspect of the present invention relates to positioning filters exposing the TiO2 and silver particles present in the filters, to the UVC radiation, catalyzing the anti-microbial activity of
the filters.

Yet another aspect of the present invention relates to a disinfecting light fixture wherein the UVC
light source is guarded to prevent the UVC from contacting any humans/ animals present close to
or under the light fixture, enabling illumination and disinfection simultaneously.

Yet another aspect of the present in relates to a disinfecting light fixture wherein the internal
structures air pathway controls the speed and time period of the air for which it is subjected to the
UVC radiation by controlling the quantity of the suction and exhaust air regulated by varying
RPM of the fan.

Yet another aspect of the present invention relates to filters wherein they are a sandwiched
structure of a plurality of filters; disinfecting the air flowing through the light fixture by, up to
75%.

Yet another aspect of the present invention relates to a disinfecting light fixture system having
multi-stage disinfection comprising:

i. Engulfing impure air by means of suction fan (04) through the pre-filter (06) wherein it is
subjected to the first stage of disinfection;
ii. Subjecting air to UVC light source as a second stage of disinfection, as the air is directed
through the structured air pathway (01); and
iii. Expelling air through the post-filter (07) as the exhaust fan (05) controls the exit pathway of
air, thereby enabling a third stage of disinfection.

Yet another aspect of the present invention further relates to a disinfecting light fixture system
additionally comprising of:
i. A fourth purification component comprising a post-filtration; and

ii. A fifth purification component comprising anti-microbial coated air outlet;
iii. Percentage Total bacterial count (TBC) reduction in surrounding air of the anti-bacterial
air disinfectant system was observed in the range of 75%.
Wherein, the air inlet and outlet are located on the surface of the light fixture, such surface as well
as the inlet and outlet are coated with anti-microbial coating including a metal based antiviral
and/or antibacterial coating.

BRIEF DESCRIPTION OF DRAWINGS:
The foregoing detailed description of embodiments is better understood when read in conjunction
with the appended drawings. For the purpose of illustrating the disclosure, example constructions
of the disclosure are shown in the present document; however, the disclosure is not limited to the
specific methods and apparatus disclosed in the document and the drawings.
The detailed description is given with reference to the accompanying figures.
Figure 1 of the present invention shows an internal architecture of a light fixture with multistage disinfecting system 100 in accordance with an exemplary embodiment of the present invention.
Figure 2 of the present invention shows a block diagram of a light fixture with multistage
disinfection system 100 in accordance with an exemplary embodiment of the present invention.

Figure 3 of the present invention shows one of the embodiments of the present invention
Page 6 of 13
which is related to air pathway in accordance with an exemplary embodiment of the present
invention.

DETAILED DESCRIPTION OF THE INVENTION:
Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail.
The words "comprising," "having," "containing," and "including," and other forms thereof, are
intended to be equivalent in meaning and be open ended in that an item or items following any
one of these words is not meant to be an exhaustive listing of such item or items, or meant to be
limited to only the listed item or items. It must also be noted that as used herein and in the
appended claims, the singular forms "a," "an," and "the" include plural references unless the
context clearly dictates otherwise. Although any systems and methods similar or equivalent to
those described herein can be used in the practice, the exemplary, systems and methods are now
described. The disclosed embodiments are merely exemplary of the disclosure, which may be
embodied in various forms.

Various modifications to the embodiment will be readily apparent to those skilled in the art and
the generic principles herein may be applied to other embodiments. However, one of ordinary
skill in the art will readily recognize that the present disclosure is not intended to be limited to the
embodiments illustrated but is to be accorded the widest
scope consistent with the principles and features described herein.

According to various embodiments of the present invention that are described
below a system for multi-stage air disinfection system for a light fixture is provided, wherein the
disinfecting light fixture (100) having/comprising of:
a. a housing compartment (10);
b. at least one UVC source (20); and
c. at least a light source in the visible wavelength region;
Characterized wherein the housing compartment has at least:
i. an internally structured air pathway (01);
ii. air inlet (02) connected to a suction fan (04) and a pre-filter (06);
iii. air outlet (03) connected to an exhaust fan (05) and a post-filter (07);

In an embodiment of the present invention the disinfecting light fixture is provided with a housing
compartment wherein the housing compartment (10); has a sandwiched filter structure
comprising:
i. Nano-Silver impregnated activated carbon sponge sandwiched between two silver treated
dust mesh; and

ii. a non-woven fabric coated with TiO2.

In an embodiment of the present invention the disinfecting light fixture comprises of an internal
structured air pathway wherein the internal structured air pathway (01) is selected from a hollow
compartment having cross-sectional shape(s), a tubular structure, a zigzag structure, a circular
structure, a helical structure, a spiral structure, a panel structure, or any other such structure
directing the time and direction taken by air to travel through the light fixture.
In another embodiment of the present invention the disinfecting light fixture provides with filters,
wherein the filters (06, 07) are positioned to expose the TiO2 and silver particles present in the
filters, to the UVC radiation, catalyzing the anti-microbial activity of the filters
Yet another embodiment of the present invention relates a disinfecting light fixture, wherein the
light fixture additionally having a guarding unit to prevent the UVC from contacting any humans/
animals that may be present close to or under the light fixture, enabling Illumination &
disinfection simultaneously.

Yet another embodiment of the present invention relates to a disinfecting light fixture comprising
a mechanism to control the air subjected to disinfection , wherein the internal structured air
pathway (01) controls the speed of air and the time period for which it is subjected to UVC
radiation by controlling the quantity of suction air and/or quantity of exhaust air regulated by
varying RPM of the fan.
Yet another embodiment of the present invention relates to the housing compartment comprising
sandwiched filter structures, wherein the filters are formed by a sandwiched structure of a
plurality of filters (06, 07) selected from Nano silver impregnated, activated carbon filters,
sponges, dust filters, dust mesh, non-woven fabric or such other industrially acceptable filter(s);
disinfecting air flowing through the fight fixture by, up to 75% (free of microbes).

Yet another embodiment of the present invention relates a disinfecting light fixture system having
multi-stage disinfection comprising:
i. Engulfing impure air by means of suction fan (04) through the pre-filter (06) wherein it is
subjected to the first stage of disinfection;
ii. Subjecting air to UVC light source as a second stage of disinfection, as the air is directed
through the structured air pathway (01); and
iii. Expelling air through the post-filter (07) as the exhaust fan (05) controls the exit pathway of
air, thereby enabling a third stage of disinfection.

Yet another embodiment of the present invention relates to a disinfecting light fixture system,
additionally comprising:
i. A fourth purification component comprising a post-filtration; and
ii. A fifth purification component comprising anti-microbial coated air outlet;
iii. Percentage Total bacterial count (TBC) reduction in surrounding air of the anti-bacterial air
disinfectant system was observed in the range of 75%.
Wherein, the air inlet and outlet are located on the surface of the light fixture, such surface as
well as the inlet and outlet are coated with anti-microbial coating including a metal based
antiviral and/or antibacterial coating.

The second and fourth purification components comprising a pre-filtration and post-filtration,
wherein the filters are formed by a sandwiched structure of a plurality of filters selected from
but not limited to nano silver impregnated, activable carbon filters, sponges, dust filters, dust
mesh, non-woven fabric or such other industrially acceptable filter(s).

As the air travels through the light fixture, the Ultra Violet radiation acts upon the air in two
ways:
i. as the UV radiation directly contacts the air and disinfects it;
ii. as the UV radiation contacts the metal impregnated coating, present all over the surface of
the light fixture, the blower fans as well as the filters, the anti-microbial activity of the coating is
accelerated as the UV radiation activates the said coating.

Referring to the accompanying Figure 1, an internal architecture of a light fixture with
multistage disinfecting system 100 as per an embodiment of the present invention is seen,
which comprises a housing compartment 10, UVC source 20 and a light source in the visible
wavelength region [not shown in figure]. Wherein, a housing compartment 10 consists of an air
path way 01, an air inlet 02, an air outlet 03, a suction fan 04, an exhaust fan 05, a pre-filter 06
and a post filter 07. A UVC light source 20 is located within the air path way 01.
Referring to the accompanying Figure 2, a block diagram of a light fixture with multistage
disinfection system 100 as per an embodiment of the present invention is seen, wherein an impure
air is sucked by suction fan 04 through pre-filter 06 which further travels through the air path way
01 wherein impure air is purified by means of UVC lamp 20. An exhaust fan 05 delivers fresh air
into the room through post filter 07.

Referring to the accompanying Figure 3, an alternate embodiment of the present invention is
seen, wherein a light fixture with multi-stage disinfecting system 100 comprises a housing
compartment 10 which is comprising an air path way 01, an air inlet 02, an air outlet 03, a suction
fan 04, an exhaust fan 05, a pre-filter 06 and a post filter 07. A UVC light source 20 is located
within the air path way 01. The area subjected to UVC light source 20 is increased by means of
internal structured air pathways 01. Thereby enabling control over the time of subjecting a
particular batch of air to UVC radiation. The shape of the air pathway is selected but not limited
to zigzag, spiral, circular, helical, etc.

ADVANTAGES OF THE INVENTION
1. The present invention is capable of providing air free of up to 75% of microbes allowing
users to breathe Hygienic and Fresh Air.
2. The present invention offers a multi-stage disinfection system to ensure at least 3 levels
of disinfection.

3. Light fixtures disclosed in this invention offer the users light in the visible range along
with an air purification system that can control microbial growth in enclosed spaces,
safe environment, malodor resistance and a high level disinfection of air.

4. The present invention has a versatile application as it is simple to install service and
maintain.
5. The present invention may be used in hospitals, schools, airports, stations, malls, hotels,
restaurants, offices, homes, elevators, toilets, tents or any other enclosed spaces that
require air purification as well as lighting.
6. The present invention deactivates the microbes sucked into the light fixture, disinfecting
the upper room air continually as the air circulates.

7. The present invention enables simultaneous and continuous disinfection of air while all
other regular activities under the visible light are allowed to continue. Illumination &
disinfection may therefore occur simultaneously despite the use of UVC. ,CLAIMS:Claim 1. A disinfecting light fixture (100) having/comprising of:
a. a housing compartment (10);
b. at least one UVC source (20); and
c. at least a light source in the visible wavelength region;
Characterized in that the housing compartment has at least:
i. an internally structured air pathway (01);
ii. air inlet (02) connected to a suction fan (04) and a pre-filter (06);
iii. air outlet (03) connected to an exhaust fan (05) and a post-filter (07);
Claim 2. The disinfecting light fixture as claimed in claim 1 wherein the housing compartment
(10); has a sandwiched filter structure comprising:
i. Nano-Silver impregnated activated carbon sponge sandwiched between two silver
treated dust mesh; and
ii. a non-woven fabric coated with TiO2.
Claim 3. The disinfecting light fixture as claimed in claim 1 wherein the internal structured air
pathway (01) is selected from a hollow compartment having cross-sectional shape(s), a tubular
structure, zigzag structure, a circular structure, a helical structure, a spiral structure, a panel
structure, or any other such structure directing the time and direction taken by air to travel through
the light fixture.
Claim 4. The disinfecting light fixture as claimed in claim 1 wherein the filters (06, 07) are
positioned to expose the TiO2 and silver particles present in the filters, to the UVC radiation,
catalyzing the anti-microbial activity of the filters
Claim 5. The disinfecting light fixture as claimed in claim 1 additionally having a guarding unit
to prevent the UVC from contacting any humans/ animals that may be present close to or under
the light fixture, enabling Illumination & disinfection simultaneously.

Claim 6. The disinfecting light fixture as claimed in claim 1 wherein 5 the internal
pathway (01) controls the speed of air and the time period for which it is subjected to UVC
radiation by controlling the quantity of suction air and/or quantity of exhaust air regulated by
varying RPM of the fan.
Claim 7. The disinfecting light fixture as claimed in
sandwiched structure of a plurality of filters
activated carbon filters, sponges, dust filters, dust mesh, non
industrially acceptable filter(s); disinfecting air flowing through the fight fixture by, up to 75%
(free of microbes).

Claim 8. A disinfecting light fixture system having multi
i. Engulfing impure air by means
subjected to the first stage of
ii. Subjecting air to UVC
the structured air pathway
iii. Expelling air through the post
thereby enabling a third stage of disinfection.
Claim 9. The disinfecting light fixture system as claimed in claim 8, additionally comprising:
i. A fourth purification component comprising a post
ii. A fifth purification
iii. Percentage Total
bacterial air disinfectant system was observed in the range of 75%.
Wherein, the air inlet and outlet
as the inlet and outlet are coated
and/or antibacterial coating.