FIELD OF INVENTION
The present invention relates to field of method of a multifunctional air filter, in particular an air filter impregnated with various compounds that has efficient multifunctional air filtering properties such as absorbing bad odor, Anti-oxidant, anti-bacterial and anti¬inflammatory properties, absorbing ammonia and volatile organic compounds (VOCs), etc.
BACKGROUND OF THE INVENTION
The background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
An air filter is basically a device that comprises of fibrous materials to discard solid particulates such as dust, pollen, mould, and bacteria. Filters containing an absorbent or catalyst such as charcoal may also remove odors, smoke, noxious fumes, organic vapors and the like from air. It is also known to use the activated carbon granules in a variety of structures including packed beds, loaded non-wovens, loaded foams, and bonded adsorbents. Granular adsorbents have been bonded and molded into shapes suitable for filtration of gases and gaseous pollutants. Air filters are used in applications wherein air

quality is important, notably in building ventilation systems, Air Conditioners, refrigerators and in engines.
Usually, an air filter purifies air by filtering dust and odor particles, absorbing polluted indoor air and filtering/purifying the absorbed air, subsequently making it clean and odor free. Further the purified air is released out from the air purifier. Thus, it can be said that the air filter absorbs polluted air from the surrounding, purifies the absorbed air, and finally releases clean air to the outside, hence, purifying the air where the air filter is installed. Therefore, in light of the aforesaid benefits, there exists a need to provide an air filter comprising improved dust-holding capacity, odor removal, resistance to airflow, and possessing antibacterial, anti-hypertension, anti-oxidant qualities with impregnated catechin, copper oxide nano particles and activated carbon.
All publications herein are incorporated by reference to the same extent as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to definition of that term provided herein, the definition of that term provided herein applies and definition of that term in reference does not apply.
The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. "such as") provided with respect

to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
OBJECT OF THE INVENTION
The main requirement entitles to consider multifunctional air filter, an air filter in particular that has odor absorbing capacity and posse's anti-oxidant, anti-inflammatory, ammonia and VOCs absorbing properties.
1. An object of the present invention is to provide a multifunctional air filter which has improved performance.
2. A primary object of the present invention is to provide a filter which has good absorptivity, is self-contained, is disposable, and has low pressure drop.
3. Another primary object of the present invention is to provide a multifunctional air filter which can be easily manufactured at low cost and which can be utilized in existing Air Conditioners.
4. Yet it is another object of the present invention to provide a multifunctional air filter which provides a high gas-removal efficiency and a high absorbing capacity combined with a small volume and low pressure drop .
BRIEF DESCRIPTION OF THE DRAWINGS
The following is a brief description of the preferred embodiments with reference to the accompanying drawings. It is to be understood that the features illustrated in and described

with reference to the drawings are not to be construed as limiting of the scope of the
invention.
The accompanying drawings are included to provide a further understanding of the present
invention, and are incorporated in and constitute a part of this specification. The drawings
illustrate exemplary embodiments of the present invention and together with the
description, serve to explain the principles of the present invention.
The diagrams are for illustration only, which thus is not a limitation of the present
invention. In the accompanying drawings:
FIG. 1 illustrates a flow diagram of a process for preparation of CU2O NP according to an
embodiment of the present invention.
FIG. 2 illustrates a flow diagram of the process of preparation of various solutions
(catachin, activated carbon, etc.) and impregnation of felt.
FIG. 3 illustrates a schematic view of the Activated Carbon fabric (ACF) filter;
ADVANTAGES OF THE INVENTION
The invention related to multifunctional air filter comprises of various additional compounds, possessing said features:
a. Activated carbon filter: this type of filter absorbs ammonia and volatile organic
compounds (VOC's), absorbs bad odors, and keeps environment clean and hygiene.
b. Anti-bacterial capacities: copper oxide Nano-particles attached to the activated carbon
filter kills bacteria, absorbs bad odor, keeps environment clean and hygiene.

c. Antioxidant capacities: free-radical scavenging activity, absorbs ammonia and volatile organic compounds (VOC's), absorbs bad odors, enhances shelf-life of fruits and vegetables, absorbs bad odor, keeps environment clean and hygiene.
DETAILED DESCRIPTION OF THE INVENTION
To promote a comprehension of the standards of the development, references will presently be made to the figures in the illustrations and explicit language will be utilized to depict the same. This should not considered to be comprehended that no confinement of the extent of the incorporation is subsequently expected, such adjustments and further alterations in the delineated framework, and such utilizations of the standards of the innovation further, as outlined in that being thought about as would occur to one skilled in the art to which the innovation relates.
It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not intended to be restrictive thereof throughout the patent specification, a convention employed is that in the appended drawings, like numerals denote like components. As required, detailed description of the present innovation are disclosed herein; however, it is to be understood that the disclosed descriptions are merely exemplary of the invention which may be embodied in various forms. Various other objects, advantages, and features of the invention will become more readily apparent to those skilled in the art from the following detailed description when read in conjunction with the accompanying drawing. All the methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all

examples, or exemplary language (e.g., "such as") provided with respect to certain details
herein, is intended merely to better illuminate the invention and does not pose a limitation
on the scope of the invention otherwise claimed. No language in the specification should
be construed as indicating any non-claimed element essential to the practice of the
invention. Various terms as used herein are shown below.
To the extent a term used in a claim is not defined below, it should be given the broadest
definition persons in the pertinent art have given that term as reflected in printed
publications and issued patents at the time of filing.
Solution 1:
Figure 1 illustrates the process of preparation of CU2O Nanoparticles, comprising the steps
of:
a. mixing a binder PVA (5g) in the Demineralized (DM) water (500 ml) to obtain a
solution;
b. heating the mixed solution of step a in DM water at 90°C for dissolving;
c. after cooling, adding 10 grams of copper nitrate (Q1NO3) and 5 grams of sodium
hydroxide (NaOH) to the solution of step b, and stir well;
d. adding 10 grams of ascorbic acid and heating at 100°C while stirring the solution of
step c;
e. Heating the stirring the solution of step d, and holding the same for 15 minutes;
Figure 2 illustrates the process of preparation of solution 2 & 3 and impregnation of felt filter in the solution of activated carbon, comprising of below steps: Solution 2:

a. mixing 10 grams of Catechin powder to 30 ml ethanol and 50 ml DM water to obtain
a Catechin solution;
Solution 3:
b. adding 200 grams binder (PVA), 500 ml copper oxide (CU2O), 80 grams of coconut
shell activated carbon powder to 100 ml of Catechin solution of step a;
c. mix well in 1.5 litre water while stirring the solution of step b for 20 minutes;
d. dipping felt sheet in the carbon solution of step c, and holding the same for 3 0 minutes;
e. unloading the impregnated felt and drying it at 80°C in a dryer;
Figure 3 illustrates view of the activated carbon fabric filter, wherein said filter comprises of several materials including synthetic mesh, grey non-woven, green non-woven, black non-woven and, each of the material is of a particular length and width and specification. The impregnated felt fabric containing an activated carbon having a strong base such as NaOH with copper oxide nano-particles, catechin, ascorbic acid, etc. Further, the impregnated felt is additionally effective in removing volatile organic substances. The removal of such chemical contaminants result in formation of water soluble salts, which can be readily removed from the replaceable filter element by dipping in hot water, for instance. The replaceable filter element thus treated can be regenerated and is reusable by re-attachment of a strong base.
The removal of alkaline gases results in formation of chloride salts, which are water-soluble and can be readily removed from the filter element by dipping it in hot water, for instance.

The invention related to the process of preparation of multifunctional air filter comprises
of various elements having beneficial properties as mentioned below:
Activated Carbon: The activated carbon is a type of carbon that possess low-volume, small
pores. The activated carbon is used in absorbing ammonia, bad-odors, volatile organic
compounds (VOCs), and oil vapors.
Catechin: Catechin contains antioxidants, beneficial in removing hypertension, exhibits
anti-inflammatory capacities, absorbs bad odor, ammonia, VOCs and is capable of
removing free radicals from the air.
Copper oxide: The copper oxide used in this invention has an antimicrobial and
antibacterial effect.
The binder used in the air filter is preferably PVA based water soluble adhesive. Other
ingredients used are activated carbon powder, copper oxide nanoparticles, catechin, sodium
hydroxide, etc.
Consequently, the performance of the filter is determined by the gas-removal efficiency,
the capacity and the pressure drop (air resistance). The gas-removal efficiency is
determined, along with the absorption capacity, by the quantity of effective active carbon,
and, along with the pressure drop, also by the structure of the filter.

We Claim:
1. A method of multifunctional air filter comprising:
(1) that contains an impregnated, replaceable and reusable fabric filter element
(2) for reducing both odor and organic and inorganic contaminants from the air.
A multifunctional fabric filter element (2) selected from the group consisting of an absorptive activated carbon (3) having further chemical substances like Copper Oxide nano-particles (4), Catechin (5) attached thereto forming a combination of absorbing components for the multifunctional carbon filter (2); a combination of a fabric and various chemical contained therein, forming a multifunctional air filter.
2. The multifunctional air filter (1) of claim 1, wherein the filter comprises of an activated carbon (3) that posses absorbing capacities that can absorb bad odor, ammonia and volatile organic compounds (VOCs), operatively associated with the plurality of other compounds.
3. The multifunctional air filter (1) of claim 1, wherein the filter further comprises of an anti-microbial compound Copper Oxide, Nano-particles (4) operatively associated with the plurality of chemical compounds and the activated carbon (3).
4. The multifunctional air filter of claim 1, wherein the filter further comprises of an anti¬oxidant compound catechin (5) capable of capturing free radicals, operatively associated with the activated carbon (3).
5. A multifunctional air filter (1) as claimed in claim 1, wherein said replaceable felt fabric filter element (2) is selected from the consisting fabric containing an activated carbon
(3) attached thereto, a fabric containing an activated carbon (3) having CU2O

nanoparticle (4) and Catechin (5) attached thereto.
6. A multifunctional air filter (1) as claimed in claim 5, wherein said replaceable felt fabric filter element (2) removes various chemical contaminants that result in formation of water soluble salts, which can be readily removed from the replaceable filter element by dipping in hot water, for instance. The replaceable filter element thus treated can be regenerated and is reusable by re-attachment of a strong base.
The multifunctional air filter substantially as herein described with reference to and
as illustrated by the accompanying figures.