FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2005
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
SELF-COOLING BEVERAGE CANS.
APPLICANTS
Crompton Greaves Limited, CG House, 6th House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company.
INVENTOR
More Sachin Vasant of Crompton Greaves Ltd, Engineering Department, CG Global R&D Centre, Kanjur (E), Mumbai 400042, Maharashtra, India; an Indian National.
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

TECHNICAL FIELD OF THE INVENTION:
This invention relates to the field of cans and mechanical assemblies. Particularly, this invention relates to a self-cooling liquid can apparatus.
BACKGROUND OF THE INVENTION:
Beverage cans for storing drinks such as soft drinks and beers are commonly available. They are an aesthetically preferred choice in lieu of its looks and merchandising. The metal exterior acts as a better conductor in cooling, and hence provides a faster cooling mechanism, and provides the user with a better cooled beverage when cooled in a refrigerator.
However, the beverage can needs to be appropriately cooled in a refrigerator at suitable temperatures and for suitable periods of time, for one to enjoy a cold beverage. This cooling wastes time and energy, and thus, a beverage which is not cool can never be served readily.
Hence, there is a need for an apparatus which provides a ready cooling mechanism.

OBJECTS OF THE INVENTION:
An object of the invention is to increase the convenience of providing a cooled drink in a container / beverage can.
Another object of the invention is to provide a readily cooled drink packaged in a container / beverage can.
Yet another object of the invention is to provide an economic apparatus for cooling a beverage container.
Still another object of the invention is to reduce the amount of energy and money wasted in cooling a beverage container by conventional method such as in a refrigerator.
SUMMARY OF THE INVENTION:
According to this invention, there is provided self-cooling liquid can apparatus adapted to cool said liquid, resident inside it, without refrigeration,

said apparatus comprises:
a) a dual chamber container comprising a first chamber and a second chamber placed in a co-axial manner, wherein said first chamber is adapted to contain a liquid, and wherein said second chamber is adapted to contain a pressurized coolant which exhibits endothermic properties upon its release from pressurized condition;
b) separating means adapted to separate said first chamber from said second chamber;
c) capillary tube, adapted to be located at an opening on said diaphragm and extending into said first chamber, being engulfed by the liquid in said first chamber, said capillary tube adapted to provision release of said pressurized coolant from said second chamber into said first chamber;
d) sealing means on said can along with an opening means adapted to open said can thereby releasing pressurized coolant from said second chamber into said first chamber; and
e) valve at said second chamber in order to fill-in said pressurized coolant.
Typically, said second chamber is seated atop said first chamber. Alternatively, said second chamber envelops said first chamber.

Typically, said valve is a one-way valve. Typically, said separating means is a diaphragm. Preferably, said separating means is a metal diaphragm.
Typically, said separating means said includes an opening means adapted to allow flow of coolant from said second chamber to said first chamber.
Typically, said capillary tube includes perforations on the body of said capillary tube to allow said coolant from said second chamber to flow into said first chamber.
Typically, said capillary tube includes backflow prevention means adapted to prevent backflow of liquid or coolant into said capillary tube, and thereby into said second chamber.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:

The invention will now be described in relation to the accompanying drawings, in which:
Figure 1 illustrates a first schematic arrangement of the components of the apparatus; and
Figure 2 illustrates a second schematic arrangement of the components of the apparatus.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
According to this invention, there is provided a self-cooling liquid can apparatus, for cooling said liquid resident inside it without refrigeration, when it is opened.
Figure 1 illustrates a first schematic arrangement (100) of the components of the apparatus of this invention.
Figure 2 illustrates a second schematic arrangement (200) of the components of the apparatus of this invention.

In accordance with an embodiment of this invention, there is provided a dual chamber container comprising a first chamber (110) and a second chamber (120) in a co-axial manner.
Typically, the volume of said second chamber is less than the volume of said first chamber.
The first chamber is adapted to hold a liquid (170), wherein the liquid is, preferably, beverage of choice, as filled in a filling plant.
According to this invention, said second chamber is a coolant chamber which typically contains a pressurized coolant (150). Preferably, the pressurized coolant is a common, inert, tasteless, odorless, liquefied gas. Typically said coolant is liquefied nitrogen. Alternatively, the coolant is Carbon-dioxide.
The contents in the both chambers are stored in a pressurized manner.
Typically, said second chamber is seated atop said first chamber.
Alternatively, said second chamber envelops said first chamber.

In accordance with another embodiment of this invention, there is provided a separating means (130) adapted to separate said first chamber from said second chamber.
Typically, said separating means is a diaphragm. Preferably, it is a metal diaphragm. Said metal diaphragm contains an opening (140) to allow flow in a defined direction i.e. from said second chamber to said first chamber.
In accordance with yet another embodiment of this invention, there is provided a capillary tube (160), adapted to be located at said opening on said diaphragm and extending into said first chamber, being engulfed by the beverage in said second chamber. Typically, the capillary tube has small holes throughout its length. The capillary tube does not soak in the beverage and prevents backflow of the liquid into said second chamber.
In accordance with still another embodiment of this invention, there is provided a sealing means (190) at the top of the can along with an opening means adapted to open said can to consume / pour out the beverage.

In accordance with an additional embodiment of this invention, there is provided a valve (180) to fill in said coolant in said second chamber.
Typically, the valve is a one-way valve located at the operative bottom of said can to fill in said coolant. Thus, liquid nitrogen is filled through the one way valve at the bottom.
When the lid is opened / torn by a user, as the pressurized chamber is exposed to atmospheric temperature, the liquid nitrogen, from said second chamber, passes through capillary tube into said first chamber i.e. through the beverage. The liquid nitrogen expands as it comes out of the capillary tube. This expansion is endothermic in nature. The Nitrogen absorbs heat from the beverage thereby cooling it.
Thus, in accordance with this invention, there is no refrigeration system needed for storage of these containers. It cools the beverage when container is opened.

We claim,
1. A self-cooling liquid can apparatus adapted to cool said liquid, resident inside it, without refrigeration, said apparatus comprising:
a. a dual chamber container comprising a first chamber and a second chamber
placed in a co-axial manner, wherein said first chamber is adapted to contain
a liquid, and wherein said second chamber is adapted to contain a
pressurized coolant which exhibits endothermic properties upon its release
from pressurized condition;
b. separating means adapted to separate said first chamber from said second
chamber;
c. capillary tube, adapted to be located at an opening on said diaphragm and
extending into said first chamber, being engulfed by the liquid in said first
chamber, said capillary tube adapted to provision release of said pressurized
coolant from said second chamber into said first chamber;
d. sealing means on said can along with an opening means adapted to open said
can thereby releasing pressurized coolant from said second chamber into
said first chamber; and

e. valve at said second chamber in order to fill-in said pressurized coolant.
2. An apparatus as claimed in claim 1 wherein, said second chamber is seated atop said first chamber.
3. An apparatus as claimed in claim 1 wherein, said second chamber envelops said first chamber.
4. An apparatus as claimed in claim 1 wherein, said valve is a one-way valve.
5. An apparatus as claimed in claim 1 wherein, said separating means is a diaphragm.
6. An apparatus as claimed in claim 1 wherein, said separating means is a metal diaphragm.
7. An apparatus as claimed in claim 1 wherein, said separating means said includes an opening means adapted to allow flow of coolant from said second chamber to said first chamber.

8. An apparatus as claimed in claim 1 wherein, said capillary tube includes perforations on the body of said capillary tube to allow said coolant from said second chamber to flow into said first chamber.
9. An apparatus as claimed in claim 1 wherein, said capillary tube includes backflow prevention means adapted to prevent backflow of liquid or coolant into said capillary tube, and thereby into said second chamber.