Title of Invention

A CHEMICAL MIXTURE BASED HEAT PACK FOR SELF HEATING OF RETORT POUCH PROCESSED FOOD

Abstract The invention relates to a chemical mixture based heat pack for self heating of retort pouch processed food in a flexible package, to the threshold consumption temperature. The chemical mixture on coming in contact with the liquid reagent, undergoes exothermic reaction and heats the food in an acceptable time in a safe and efficient manner. The oxidation reaction described in the invention generates heat in a controlled and sustained manner for a period of time sufficient to warm the food in the food chamber without any of the hazards e.g. fumes flame, boil over the explosion. The chemical mixture is packed in a non-woven polypropylene fabric sheet and then kept and sealed in a polypropylene or octane based linear low density poly ethylene pouch. Liquid reagent consists of a mixture of two liquids packed in a pouch made of a polymeric material. One of the liquid reagents is water while the other is poly hydroxy alcohol. The liquid mixture is given a thermal treatment to prevent microbial growth during storage. Exothermic reaction commences as soon as the liquid mixture is brought in contact with the solid chemical mixture packed in the non-woven polypropylene fabric sheet.
Full Text FIELD OF INVENTION
The invention relates to a chemical mixture based heat pack for use in self-heating of ready--to-.eat (RTE) retort pouch processed food to a suitable temperature at which it can be consumed.
PRIOR ART
In this age of fast life style there is an increasing demand for convenient, hot and palatable meals. Such type of meals also helps hikers, climbers, fire fighting crews etc in their endeavors. However, the largest demand is from military personnel, for tasty convenient hot meal with a prolonged shelf life to suit their operational requirements. With the advent of ready-to-eat (RTE) retort pouch processed foods, one portion of the problem was solved. Still the requirement of heating gadgets for warming food persisted. In this context, the discovery of flame-less heating source based on certain exothermic chemical reaction to heat the meal, eliminates the necessity to carry portable stove, fuel tablets etc for heating the meal. Such self-heating systems thus help to heat the meals without a hot flame, which could be easily detected, using an infrared device.
Self-heating devices are designed for convenient heating of food materials to consumption temperature when conventional heating sources are either inconvenient or unavailable. Such devices for heating liquid food items such as soups, beverages etc and ready to eat food products utilize certain exothermic chemical reactions for the generation of heat. Chemical reactions used for self-heating system can be classified into seven groups. The simplest method of heat generation is by using hydration reaction. Second group of the reaction employs hydrolysis process. The third system involves an acid-base reaction. Fourth method employs spontaneous oxidation-reduction reaction in an aqueous medium whereas the fifth group of reaction involves kinetically non-spontaneous oxidation-reduction reaction between a solid oxidant and a solid reducer. Yet another method of heat generation especially that used for reusable body warmers utilizes a physical process of crystallization of a chemical from a super
cooled solution. Seventh method of exothermic reaction involves an electrochemical reaction of a powdered alloy with water in the presence of an electrolyte.
A type of self-heating device which utilizes the hydration process, generates heat due to the exothermic reaction during .the hydration of chemicals such as anhydrous calcium chloride, sodium carbonate, sodium acetate etc. The device is relatively simple and generates heat by the addition of water to the chemicals. Such devices are used as biological fluid warmer also. The following US Patent No. 4067313 (Donnelly) describes self-heating system mainly based on a mixture of above compounds.
Another type of self-heating device utilize the hydrolysis process of anhydrous Calcium Oxide, anhydrous Aluminum trichloride etc. Examples of this type are found in US patent nos., 4501259 (Apellaniz), 4559921 (Benmussa), 4640264 (Yamaguchi), 4741324 (Ina et al), 4748035 (Apellaniz), 4773389 (Hamasaki), 4809673 (Charvin), 5388565 (Ou) and 6289889 (Bell et al).
The chemicals used for both hydration and hydrolysis reactions are relatively simple to implement. But these processes suffer from a number of inherent limitations. One of the problems is the specific heat of the substance employed is very low and therefore a large volume of the substance is required to generate the optimum heat. Water is one of the inseparable constituents of these systems. Hence, a large amount of heat is used to increase the temperature of the liquid phase and it limits the temperature of the heating unit to a maximum of 100°C. Above all, the reaction products are either alkaline as in case of Calcium Oxide or acidic as in case of Aluminum trichloride.
To over come some of the defects another approach employing mixing of acids and bases was considered. The following US patents take advantage of this approach US patent no. 4753085 (Labrousse), 5542418 (James) and 5935486 (Bell et al). The system is based on a mixture of several organic and inorganic acids and bases. In this case also, large volume of substance is required to generate requisite heat. The system also suffers the draw back of using aqueous phase.
Yet another type of self-heating system uses redox reactions occurring in aqueous phase Such redox systems were used in the following US patents 3980070 (Krupa), 3998749 (Hydro et al) and 5517981 (Taub et al). In the US patent 5517981 Taub et al used a mixture of Cupric Chloride and Magnesium in the presence of water to generate heat. In the US patent no 3998749 Hydro et al used a mixture of Aluminium and Cupric Chloride with a mixed solvent system involving an aqueous and an organic solvent. In the US Patent no. 3980070 Krupa has described water activatable oxidation-reduction system containing Ferrous metal with an oxidizing medium of Cupric Carbonate, Sodium Chloride, Citric acid and Potassium Chlorate.
Redox reactions mentioned above are highly exothermic. They have higher heat output per unit volume than of hydration, hydrolysis and acid base reactions. However, these reactions progress very rapidly requiring an efficient heat transfer mechanism to dissipate heat to the food product. Most of these reactions produce significant quantities of highly inflammable gases such as hydrogen. Since the reaction is carried out in an aqueous phase a substantial amount of heat is utilized for raising the temperature of water.
Yet another type of self-heating system utilizes solid phase self-propagating high temperature reaction. It includes redox reaction process in solid state such as thermite reaction. The reaction generally involves metals and metal oxides such as Ferric, Aluminium etc. These reactions are highly efficient, gas less and generate large amount of heat per unit weight of the reagents. The reaction products are generally harmless. The rate of reaction is controlled by appropriate choice of metal and metal oxide as well as their particle size. Another advantage of the process is that the reaction is not kinetically spontaneous and hence the component can be mixed conveniently and safely placed in a single chamber. Such type of self-heating devices based on thermite reaction have been reported earlier in US patents 4013061 (Trumble et al), 4033323 (Trumble), 4506654 (Zellweger et al), 4819612 (Okamoto et al), 4949702 (Suzuki et al), 5020509 (Suzuki et al), 5220908 (Lizuna et al), and 6267110 (Tenenboum et al). The fuel mixtures used in the above patents are mixtures of metal like Aluminium or alloys such as Ferrosilicon and metal oxide like Ferric oxide or Cupric oxide.
The temperature during the solid phase self-propagating high temperature reaction may reach above 1000°C. Hence, it requires an appropriate heat transfer mechanism and safe metallic container to hold the chemicals during the reaction. More over, such devices require an ignition system to initiate the reaction. Commonly used ignition systems are based on friction, electrical ignition or thermal ignition using an external fuse. Thus the implementation of such a device involving thermite reaction is quite complicated and expensive.
Another type of heating system, prevailing in the market, is basically used as a body warmer. It consists of a reusable bag containing a super cooled supersaturated solution of a salt such as Sodium Acetate or Sodium Thiosulphate Pentahydrate. The heating process is initiated by bending a metal disc placed in the bag or by inducing crystallization by seeding with another crystal where upon the entire solid gets precipitated from the solution releasing the heat of crystallization. The advantage of such a system is that it can be reused any number of times by dipping the bag in hot water for re dissolving the solute in the solvent. However, the heat released from such system is not adequate to heat drinks such as soups, RTE food pouch etc to the consumption temperature. Moreover, a large volume of substance is required to generate the requisite amount of heat. Such systems are used only as reusable body warmers. US patent No. 3951127 (Watson et al) describes one such system.
One other self-heating system also employs an oxidation reaction. However it involves a novel metal alloy, which undergoes an electro-chemical reaction in the presence of an electrolyte solution The system developed utilizes a supercorroding alloy containing Magnesium and Iron. The composition is suitably made and powdered so that in the presence of the electrolyte solution such as Sodium Chloride solution, it acts as a minute galvanic cell and undergoes oxidation of Magnesium to it's hydroxide. Such systems are explained in the following US patents No 4522190 (Kuhn et al), 5220909 (Pickard et al) and 5355869 (Pickard).
The metal alloy system employed during the reaction is found to generate lot of hydrogen gas. Hence, such self-heating systems are advised to be used in an open place. Since water is used to activate the reaction lot of heat is lost in heating the aqueous phase. However, the solid product of the reaction is a mild alkali like Magnesium Hydroxide
Oxidation reaction is a very common reaction encountered in Organic Chemistry during analysis as well as synthesis. The oxidation processes are generally associated with liberation of heat. Common oxidizing agents used for oxidation are Potassium Permanganate, Potassium dichromate and Oxides of Chromium in specific Organic solvents such as Chromium dioxide in Pyridine. Alcohols are one type of Organic compounds prone to oxidation in presence of the above oxidizing agents. Primary alcohols are oxidized to carboxylic acid by heating with aqueous Potassium Permanganate solution where as Potassium Dichromate oxidize primary alcohols to aldehydes, which subsequently gets oxidized to acids. Secondary alcohols are oxidized to ketones by chromium dioxide in Pyridine. An aqueous solution of oxalic acid is oxidized to Carbon dioxide by acidified Potassium permanganate above 60°C. All these oxidation processes are accompanied by liberation of heat.
Oxidation of Ethylene Glycol by Potassium.Permanganate solution to Glyoxal and to acid is well known reaction in Organic Chemistry. The oxidation of Glycerol by solid Potassium Permanganate leading to burning is another well-known process. Thus Potassium Permanganate and Potassium Dichromate are strong oxidizing agents and produce fire hazards during oxidation if the reaction is not properly controlled. The rate of oxidation of polyhydroxy alcohols is also found to be very rapid releasing quite a large amount of heat in a small time. Hence the usage of such oxidation process for the development of self-heating system is possible by precise control and containment of the intensity and duration of the reaction. In the US Patent no. 5035230 Stedit et al adopted one such method during the oxidation of Ethylene Glycol with Potassium Permanganate for heat generation. In the above patent the rapid oxidation is controlled by selective exposure of the oxidizing agent with the fuel. This is achieved by binding the Potassium Permanganate crystals in a selectively dissolvable Inorganic binding agent namely Sodium Silicate in water to form a cylindrical shape. In the US Patents 5984953 and 6116231 (Sabin et al) has adopted a similar method for controlled oxidation of Glycerol in the presence of Potassium permanganate. Although these inventions seem to work, it requires elaborate method involving the preparation of the bound oxidizing agent.
The chemical based systems described in the prior art utilize an expensive and complicated rigid container for heating food pouch especially those involved in thermite reaction. In order to make it more user friendly and cost effective, it was necessary to utilize a chemical system, which does not produce undesirable gases during the heating process. The system described here in is a system in which the excessive heat generated is controlled by a simple method.
OBJECTS OF THE INVENTION
The main object of the present invention is to provide a chemical mixture based heat pack for self heating of ready to eat retort pouch processed food.
Another object of the present invention is to provide a chemical mixture based heat pack for self heating of retort pouch processed food which does not need a stove, fire, electrical or other power source.
Yet another object of the present invention is to provide a chemical mixture based heat pack for self heating of retort pouch processed food from a temperature of 5-10°C to consumption temperature of 60-65°C.
Still another object of the present invention is to provide a chemical mixture based heat pack for self heating of retort pouch processed food wherein a large amount of heat energy is generated quickly with prolonged release in a reasonable period of time (10 - 15 minutes).
Further object of the present invention is to provide a chemical mixture based heat pack for self heating of retort pouch processed food which is safe to store, transport and operate.
Still further object of the present invention is to provide a chemical mixture based heat pack for self heating of retort pouch processed food which has no hazards like fumes, flame, boil over and explosion.
DESCRIPTION OF INVENTION
According to this invention there is provided a chemical mixture based heat pack for self heating of retort pouch processed food comprising of a storage cell and a polypropylene pouch, the said polypropylene pouch comprising of a heater pad and ready to eat retort pouch processed food;
wherein the said storage cell is prepared by diluting a polyhydroxy alcohol preferably glycerol with water to obtain a solution of density between the range 1.0679 g per ml to 1.1125 g per ml, then packing 40 to 120 ml of the said liquid reagent in polypropylene sachet and subjecting it to heat treatment at a temperature of 95 to 100°C for 2 to 10 minutes,
said heater pad being prepared by filling 0.1 g to 0.3 g per sq cm of the solid reaction mixture in a non-woven polymeric fabric sheet, which is then heat sealed to form a grid structure, wherein the said solid reaction mixture is prepared by mixing an oxidizing agent preferably potassium permanganate with finely powdered alkaline metal oxide preferably calcium oxide in an inert atmosphere devoid of moisture,
said heater pad and the said ready to eat retort pouch processed food is packed in said polypropylene pouch.
In accordance with the present invention heat is generated by the hydrolysis of metal oxide and controlled oxidation of an alcohol using an oxidizing agent. Heater consists of a solid reactant which is a mixture of two chemicals, one of them is an alkaline earth metal oxide preferably calcium oxide and the other one is a solid oxidizing agent preferably potassium permanganate. Since the reaction between the oxidizing agent and the liquid is highly spontaneous and exothermic one, it was considered appropriate to control it. The moderator mixed with the oxidizing agent controls the spontaneous oxidation reaction. The oxidation process is also controlled by suitably adjusting the concentration of the liquid mixture as well as suitably packing in the chemical mixture in non woven polypropylene fabric sheet. DESCRIPTION OF THE DRAWINGS Present invention is illustrated by the accompanying drawings :
Fig 1 Shows the grid structure of the heater pad
Fig2 & 2(a) Show the cross-sectional and isometric view of the self heating food pack
Fig 3 Shows the rectangular ready-to-eat food pouch
Fig 4 Shows the storage cell
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Fig 1 Shows one suitable configuration of Grid structure of the heater pad made of polymeric non-woven fabric sheet containing the mixture of oxidizing agent and the moderator Calcium Oxide. The fabric sheet is heat sealed after filling the solid reagent into a number of compartments 2. The amount of solid mixture required to be filled up in each compartments depends on the heat requirement for warming the food sample, the atmospheric temperature conditions and the concentration of the liquid reagent used. When the atmospheric temperature is lower, a larger weight of the solid reagent may be required in each compartment. As the concentration of the liquid reagent is increased the risk of localized heating, leading to burning, also increases. It will be apparent to one skilled in the art that any appropriate concentration of the oxidizing agent and a suitable weight per sq cm of the fabric sheet is contemplated for use in the present invention. The non-woven polypropylene sheet containing the solid reagent and sealed on all the sides is called the heater pad
The number of compartments depends on the heat requirement of the RTE food. This also depends on the external temperature conditions. Each compartment is separated from the other by seal. The preferred geometry also helps in the penetration of the liquid reagent through the fabric sheet and reaches the solid reagent as well as controlled exposure of the oxidizing agent towards the liquid mixture. The area of each compartment is determined by the amount of solid reagent needed to be filled in it, which in turn depends on the temperature conditions in which the system is required for operation. The rectangular geometry of the fabric sheet helps in filling it with the solid reagent followed by convenient sealing preferably using a hand sealer. The size and shape of each compartment can be altered appropriately to suit the specific requirements. However, it should provide the desired control on the duration and intensity of the exothermic chemical reaction and thermal energy release during the process.
Fig 2 & 2(a) show the crossectional and isometric view of self heating food pack comprising of a rectangular multi layer bag, meant for accommodating the ready to eat retort pouch processed food 4 in the food chamber 5 and the heater pad 1 in the reaction chamber 7. The rectangular multi-layer bag is made of polymeric packaging material selected from a group of polypropylene (PP), or multi-layer co-extruded films such as polypropylene/ nylon/ polypropylene (PP/Nyl/PP), low density polyethylene/ nylon/ low density polyethylene. Reaction chamber 7 is a long pouch made up of any one of the above packaging material having an area of approximately 600 sq cm to suitably accommodate the heater pad. All the four sides of this are sealed. The food chamber 5 is a small pouch of area approximately 400 sq cm. All the four sides of the food chamber are sealed along with the reaction chamber 7. After the heating process, the food pouch is taken out by cutting open the food pouch chamber using a blade or scissors.
Fig 3 shows the rectangular ready-to-eat retort pouch processed food 4, which is available commercially, of the shelf and contains 280-300 g of food.
Fig 4 shows the front view of the solution sachet 8, which is a rectangular pouch made of polypropylene. It consists of a solution 9, constituting of two liquid reagents having density between 1.0679 g per ml and 1.1125 g per ml. The solution is paked in polypropylene sachet and subjected to heat treatment to prevent .microbial growth. 40 to 120 ml of solution is packed in the pouch for self heating system depending on the nature of the RTE food and external temperature conditions. The solution sachet is called storage cell.
According to the present invention, the process for preparation of a chemical mixture based heat pack for self heating of retort pouch processed food comprises of the steps of:
a) Preparation of liquid reagent - storage cell
The liquid reagent is prepared by dilution of a polyhydroxy alcohol preferably Glycerol with water. The liquid reagent is prepared by mixing appropriate quantities of
the two liquids to get the solution of density between the range 1.0679 g per ml and 1.1125 g per ml. The solution is then packed in polypropylene sachet and subjected to heat treatment at a temperature of 95 to 100 °C for 2 to 10 minutes to prevent any microbial growth. The solution sachet is called storage cell. 40 to 120 ml of the solution is packed in the pouch for self-heating system depending on the nature of the RTE food and external temperature conditions.
b) Preparation of solid reagent
The solid reagent is made by manual or automatic mixing of the oxidizing agent preferably Potassium Permanganate with finely powdered alkaline metal oxide preferably Calcium Oxide in an inert atmosphere devoid of moisture. The mole fraction of the oxidizing agent in the solid reagent is between 0,6 to 0.9 mole.
c) Preparation of chemical heater pad
The non-woven polymeric fabric sheet, which is heat scalable, is filled with 0.1 g to 0.3 g per sq cm of the solid reaction mixture prepared in step b), and then the non-woven polymeric fabric sheet is heat sealed to form a grid structure called the heater pad, The amount of solid reagent mixture to be filled in each compartment of the grid structure varies according to the heat requirement for warming of the food sample, the atmospheric temperature conditions and the concentration of the liquid reagent used.
d) Packaging of heat pack and food pouch
The heater pad of step c) is then packed in a long polypropylene pouch along with a ready to eat retort pouch processed food and sealed followed by packing in a pulp board box along with the storage cell containing liquid reagent prepared in step a) and a blade for cutting the storage cell.
This invention will now be illustrated with working examples, which are intended to be typical examples to explain the technique of the present invention and are not intended to be taken restrictively to imply any limitation to the scope of the present invention.
WORKING EXAMPLES:
Working example 1
25 grams of Potassium Permanganate was weighed into a clean 100 ml beaker. To the said sample added 5 grams of finely powdered Calcium Oxide and placed the beaker with the sample in a Glove box/glove bag purged with moisture free nitrogen gas. The chemical samples were mixed well using a glass rod and left in the inert atmosphere till further use. Two pieces of 50 gsm non woven polypropylene fabric sheet of the dimension 12 cm X 14 cm were cut using a scissors. The sheets were placed together and three sides were sealed to get the shape of a pouch with one 14 cm side open. The sheets were sealed vertically thrice along the 12 cm side at equal distance to get 4 compartments. Accurately weighed 2.5 grams of the above chemical mixture for each compartment and sealed it to get 4 sleeve lets. Continued the process further so as to get 12 sleeve lets. The heater pad was then packed in a long polypropylene pouch of the size 18 cm X 32 cm along with a ready to eat retort pouch processed food and sealed. 20 grams of Glycerol was mixed with 30 grams of water in a beaker, packed in polymeric pouch and sealed to get the solution pouch. The solution pouch was dipped in boiling water for 5 minutes and then taken out. The whole system along with the solution pouch and a blade was then packed in a pulp board box.
Working example 2
50 grams of Potassium Permanganate was weighed into a clean 250 ml beaker. To the said sample added 10 grams of finely powdered Calcium Oxide and placed the beaker with the sample in a Glove box/glove bag purged with moisture free nitrogen gas. The chemical samples were mixed well using a glass rod and left in the inert atmosphere till further use. Two pieces of 50 gsm non woven polypropylene fabric sheet of the dimension 14 cm X 16 cm were cut using a scissors. The sheets were placed together and three sides were sealed to get the shape of a pouch

with one 14 cm side open. The sheets were sealed vertically thrice along the 16 cm side at equal distance to get 4 compartments. Accurately weighed 3.75 grams of the above chemical mixture for each compartment and sealed it to get 4 sleeve lets. Continued the process further so as to get 16 sleeve lets (Heater pad). The heater pad was then packed in a long polypropylene pouch of the size 18 cm X 32 cm along with a ready to eat retort pouch processed food and sealed. 35 grams of Glycerol was mixed with 50 grams of water in a beaker, packed in polymeric pouch and sealed to get the solution pouch. The solution pouch was dipped in boiling water for 5 minutes and then taken out. The whole system along with the solution pouch and a blade was then packed in a pulp board box. The system is ready for use as per the method of use described below.
METHOD OF USE
The self-heating system described above is operated in the following way. The outer pulp board box is opened and the polymeric pouch containing the heater and the food pouch is taken out. The storage cell is also taken out from the box. Using the blade provided, the polypropylene pouch containing the heater pad and food pouch is cut open. The storage cell is also cut using the blade and the solution in it is completely transferred into the pouch containing the heater pad. The heater pad is pressed a little with the solution to initiate the reaction. As soon as the reaction commences (when it starts heating up), the upper end of the reaction chamber is folded and the whole system is kept back into the pulp board box. The system is placed horizontally on a plane surface for 10 to 15 min. The RTE food product reaches the consumption temperature by this time. Then the pulp board box is opened and the contents are taken out and the food pouch is removed. The food pouch can be cut open and the hot product is ready for consumption. The chemical mixture after the reaction is slightly alkaline in nature. This is kept back in the carton along with the pouch and discarded.
The chemical mixture based heat pack of the present invention can be conveniently used for heating any liquid, semi solid or solid retort pouch processed ready-to eat food product. Alterations in the weight of solid reagent, volume as well as density of the liquid reagent and the
number of compartments in the non woven polypropylene sleeves may be required for heating the food product from lower temperatures.
It is to be understood that the process of the present invention is susceptible to modifications, changes, adaptations by those skilled in the art. Such modifications, changes, adaptations are intended to be within the scope of the present invention which is further set forth under the following claims.


WE CLAIM:
1. A chemical mixture based heat pack for self heating of retort pouch processed
food comprising of a storage cell and a polypropylene pouch, the said
polypropylene pouch comprising of a heater pad and ready to eat retort pouch
processed food;
wherein the said storage cell is prepared by diluting a polyhydroxy alcohol preferably glycerol with water to obtain a solution of density between the range 1.0679 g per ml to 1.1125 g per ml, then packing 40 to 120 ml of the said liquid reagent in polypropylene sachet and subjecting it to heat treatment at a temperature of 95 to 100°C for 2 to 10 minutes,
said heater pad being prepared by filling 0.1 g to 0.3 g per sq cm of the solid reaction mixture in a non-woven polymeric fabric sheet, which is then heat sealed to form a grid structure, wherein the said solid reaction mixture is prepared by mixing an oxidizing agent preferably potassium permanganate with finely powdered alkaline metal oxide preferably calcium oxide in an inert atmosphere devoid of moisture,
said heater pad and the said ready to eat retort pouch processed food is packed in said polypropylene pouch.
2. A chemical mixture based heat pack for self heating of retort pouch processed
food as claimed in claim 1 wherein the mole fraction of the oxidizing agent in
the said solid reagent is between 0.6 to 0.9 mole.
3. A chemical mixture based heat pack for self heating of retort pouch processed
food as claimed in claim 1 wherein the said non woven polymeric fabric has a
plurality of fine pores to facilitate the penetration of liquid reagent through the
packaging material and reach the solid reactant in it.
4. A chemical mixture based heat pack for self heating of retort pouch processed
food substantially as described and exemplified herein.




Documents:

2253-del-2004-abstract.pdf

2253-del-2004-claims.pdf

2253-DEL-2004-Correspondence-Others-(01-06-2010).pdf

2253-DEL-2004-Correspondence-Others-(04-06-2009).pdf

2253-DEL-2004-Correspondence-Others-(06-05-2010).pdf

2253-DEL-2004-Correspondence-Others-(13-12-2010).pdf

2253-DEL-2004-Correspondence-Others-(16-04-2010).pdf

2253-DEL-2004-Correspondence-Others-(20-05-2010).pdf

2253-del-2004-correspondence-others.pdf

2253-del-2004-correspondence-po.pdf

2253-del-2004-description (complete).pdf

2253-del-2004-drawings.pdf

2253-del-2004-form-1.pdf

2253-del-2004-form-18.pdf

2253-del-2004-form-2.pdf

2253-DEL-2004-Form-3-(04-06-2009).pdf

2253-DEL-2004-GPA-(13-12-2010).pdf

2253-DEL-2004-GPA-(20-05-2010).pdf


Patent Number 245496
Indian Patent Application Number 2253/DEL/2004
PG Journal Number 04/2011
Publication Date 28-Jan-2011
Grant Date 21-Jan-2011
Date of Filing 11-Nov-2004
Name of Patentee DIRECTOR GENERAL,DEFENCE RESEARCH & DEVELOPMENT ORGANISATION
Applicant Address DEFENCE RESEARCH & DEVELOPMENT ORGANISATON MINISTRY OF DEFENCE, GOVT OF INDIA, WEST BLOCK-VIII,WING-1 SECTOR-1, RK PURAM NEW DELHI-110066
Inventors:
# Inventor's Name Inventor's Address
1 VALLAYIL APPUKUTTAN SAJEEVKUMAR DEFENCE FOOD RESEARCH LABORATORY, SIDDARTHANAGAR P.O., MYSORE-570011
2 AMARINDER SINGH BAWA DEFENCE FOOD RESEARCH LABORATORY, SIDDARTHANAGAR P.O., MYSORE-570011
3 MANISH GUPTA DEFENCE FOOD RESEARCH LABORATORY, SIDDARTHANAGAR P.O., MYSORE-570011
4 ANANTHA NARAYANA SRIVATSA DEFENCE FOOD RESEARCH LABORATORY, SIDDARTHANAGAR P.O., MYSORE-570011
PCT International Classification Number F/24S 1/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA