Patents by Inventor Ratan K. Chaudhuri

Ratan K. Chaudhuri has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5110585
    Abstract: The invention relates primarily to quaternized polycyclic compounds having the formula ##STR1## wherein m is an integer having a value of from 1 to 4; R is alkylene having from 3 to 8 carbon atoms and is optionally substituted with C.sub.1 to C.sub.4 alkyl; R.sub.2 together with the quaternary nitrogen, forms a 5 to 14 membered heterocyclic ring, said ring containing at least 2 hetero atoms selected from the group of nitrogen, sulfur and oxygen; R.sub.1 forms a double bond in the heterocyclic ring of the quaternized nitrogen or is alkyl, alkyleneoxyalkyl, alkylhydroxy, aryl, aralkyl, aralkenyl, alkaryl, alkylamidoalkyl and X.sup.- is an anion. The invention also relates to the preparation and use of said quaternized polycyclic compounds.
    Type: Grant
    Filed: March 1, 1989
    Date of Patent: May 5, 1992
    Assignee: ISP Investments Inc.
    Inventors: Ratan K. Chaudhuri, David J. Tracy, Robert B. Login, Michael W. Helioff
  • Patent number: 5093031
    Abstract: The invention relates to properties and uses of N-hydrocarbon substituted lactams, particularly N-alkyl substituted lactams having the formula ##STR1## wherein R' is a hydrophobic radical such as linear or branched chain alkyl group containing from 8 to 27 carbon atoms, most preferably micelle forming pyrrolidones having 12 to 16 carbon atoms in the R' group. The invention particularly relates to the uses of the N-hydrocarbon substituted lactams which involve surfactant properties, such as solubility, wetting, viscosity building, emulsifying and/or complexing properties.
    Type: Grant
    Filed: October 14, 1988
    Date of Patent: March 3, 1992
    Assignee: ISP Investments Inc.
    Inventors: Robert B. Login, Ratan K. Chaudhuri, Rama K. Haldar, Mohamed M. Hashem, Michael W. Helioff, David J. Tracy
  • Patent number: 5071463
    Abstract: An emulsifiable concentrate comprising an agriculturally active chemical, a surfactant, an organic diluent and a solvent having first and second components, the first component being capable of solubilizing the agriculturally active chemical and the second component in conjunction with the surfactant being effective to disperse the agriculturally active chemical. The inventive concentrate allows for high concentrations of the active ingredient, exhibits excellent stability and produces highly stable compositions upon dilution with water.
    Type: Grant
    Filed: December 11, 1989
    Date of Patent: December 10, 1991
    Assignee: ISP Investments Inc.
    Inventors: Kolazi S. Narayanan, Ratan K. Chaudhuri, Manilal Dahanayake
  • Patent number: 5066709
    Abstract: This invention relates to superior bioadhesive compositions having time extended adhesive properties comprising a non-toxic carrier and a polymer having between about 45 and about 70 weight % of units having the structure ##STR1## between about 50 and about 30 weight % of units having the structure ##STR2## and 2 to 7 weight % of an amine salt containing a lactam functionally derived from A and/or B, wherein R is hydrogen, alkoxy, phenyl, carboxy or --N lactam having from 3 to 6 carbon atoms; R.sub.1 is C.sub.1 to C.sub.6 alkylene and R.sub.2 is C.sub.2 to C.sub.4 alkylene; said copolymer having a number average molecular weight of about 40,000 to about 500,000 and a relatively small particle size. The invention also relates to the method of synthesizing and using the above composition.
    Type: Grant
    Filed: September 20, 1990
    Date of Patent: November 19, 1991
    Assignee: GAF Chemicals Corporation
    Inventors: Ratan K. Chaudhuri, Rama K. Haldar, Balgopal Gangadharan
  • Patent number: 5055046
    Abstract: This invention relates to superior bioadhesive compositions having time extended adhesive properties comprising a non-toxic carrier and a polymer having between about 45 and about 70 weight % of units having the structure ##STR1## between about 50 and about 30 weight % of units having the structure ##STR2## and 2 and 7 weight % of an amine salt containing a lactam functionality derived from A and/or B, wherein R is hydrogen, alkoxy, phenyl, carboxyl or --N lactam having from 3 to 6 carbon atoms; R.sub.1 is C.sub.1 to C.sub.6 alkylene and R.sub.2 is C.sub.2 to C.sub.4 alkylene; said copolymer having a number average molecular weight of about 40,000 to about 500,000 and a relatively small particle size. The invention also relates to the method of synthesizing and using the above composition.
    Type: Grant
    Filed: April 8, 1991
    Date of Patent: October 8, 1991
    Assignee: ISP Investments Inc.
    Inventors: Ratan K. Chaudhuri, Rama K. Haldar, Balgopal Gangadharan
  • Patent number: 5011941
    Abstract: The invention relates primarily to quaternized compounds having the formula ##STR1## wherein n and n' are each independently integers having a value of from 1 to 25; p is an integer having a value of from 1 to 4; Y and Y' are each independently H or CH.sub.3 ; R is linear alkyl, alkenyl, or amidoalkyl having from 8 to 22 carbon atoms and is optionally substituted with C.sub.1 to C.sub.4 alkyl; Z is linear alkylene having from 3 to 8 carbon atoms and is optionally substituted with lower alkyl and A.sup.- is an anion.
    Type: Grant
    Filed: September 14, 1990
    Date of Patent: April 30, 1991
    Assignee: GAF Chemicals Corporation
    Inventors: Ratan K. Chaudhuri, David J. Tracy, Robert B. Login
  • Patent number: 5008104
    Abstract: The invention relates primarily to quaternized compounds having the formula ##STR1## wherein n and n' are each independently integers having a value of from 1 to 25; p is an integer having a value of from 1 to 4; Y and Y' are each independently H or CH.sub.3 ; R is linear alkyl, alkenyl, or amidoalkyl having from 8 to 22 carbon atoms and is optionally substituted with C.sub.1 to C.sub.4 alkyl; Z is linear alkylene having from 3 to 8 carbon atoms and is optionally substituted with lower alkyl and A.sup.- is an anion.
    Type: Grant
    Filed: June 22, 1989
    Date of Patent: April 16, 1991
    Assignee: GAF Chemicals Corporation
    Inventors: Ratan K. Chaudhuri, David J. Tracy, Robert B. Login
  • Patent number: 4980419
    Abstract: The invention relates to polymers containing a lactam functionality and having in its molecule repeating units of the general formula: ##STR1## wherein R.sup.1 is C.sub.1 to C.sub.18 alkyl;R.sup.2 is oxygen, sulfur or amino;R.sup.3 is alkylene having 3 to 6 carbon atoms optionally substituted with lower alkyl;Z is hydrogen, an alkali metal, an alkaline earth metal or ammonia;n has a value of from 30 to 3,500 andt has a value of from 2 to 8;and to the use and synthesis of said polymer.
    Type: Grant
    Filed: July 3, 1989
    Date of Patent: December 25, 1990
    Assignee: GAF Chemicals Corporation
    Inventor: Ratan K. Chaudhuri
  • Patent number: 4910247
    Abstract: A composition containing an adhesive suitable for affixing dentures or ostomy devices to a mucous membrane, which adhesive is a mixture composed of(a) 75-25 wt. % of a blend comprising a divalent calcium salt and a monovalent sodium salt of a lower alkyl vinyl ether/maleic acid copolymer wherein the concentration of Ca is between about 10 and 15 wt. % of the blend; Na is between about 1.5 and about 4 wt. % of the blend and --COOH is between about 9 and about 25 wt. % of the blend;(b) 0-10 wt. % of a lower alkyl vinyl ether/maleic acid auxiliary metal salt wherein said metal is divalent magnesium and/or monovalent potassium and wherein said auxiliary metal represents between about 1.5 and about 15 wt. % of said auxiliary metal salt compound and(c) 25-75 wt. % of a stearic acid metal salt wherein said metal salt is magnesium stearate containing from 0% to about 75% sodium stearate.The invention also relates to the use of said composition as an adhesive used in association with mucous membranes.
    Type: Grant
    Filed: March 27, 1989
    Date of Patent: March 20, 1990
    Assignee: GAF Chemicals Corporation
    Inventors: Rama K. Haldar, Balgopal Gangadharan, Ratan K. Chaudhuri
  • Patent number: 4886890
    Abstract: This invention relates to quaternary compounds having the formula ##STR1## wherein W.sup.- is an anion; m and n are integers having a value of from 1 to 4; R is alkylene having from 3 to 8 carbon atoms; R.sub.1 is a radical having from 8 to 25 carbon atoms and is selected from the group of alkyl, alkenyl and alkoxy alkylene and each of R.sub.2, R.sub.3 and R.sub.4 is a radical having from 1 to 25 carbon atoms and is alkyl, alkoxy or ##STR2## where p has a value of from 1 to 4 and X is hydrogen or methyl. The invention also relates to the preparation and use of said diquaternized compounds.
    Type: Grant
    Filed: September 29, 1988
    Date of Patent: December 12, 1989
    Assignee: GAF Corporation
    Inventors: Ratan K. Chaudhuri, David J. Tracy, Robert B. Login
  • Patent number: 4883655
    Abstract: The invention relates primarily to quaternized polycyclic compounds having the formula ##STR1## wherein m is an integer having a value of from 1 to 4; R is alkylene having from 3 to 8 carbon atoms and is optionally substituted with C.sub.1 to C.sub.4 alkyl; R.sub.2 together with the quaternary nitrogen, forms a 5 to 14 membered heterocyclic ring, said ring containing from 1 to 2 hetero atoms selected from the group of nitrogen, sulfur and oxygen; R.sub.1 forms a double bond in the heterocyclic ring of the quaternized nitrogen or is alkyl, alkyleneoxyalkyl, alkylhydroxy, aryl, aralkyl, aralkenyl, alkaryl, alkylamidoalkyl and X.sup.- is a chloride, bromide or iodide anion. The invention also relates to the preparation and use of said quaternized polycyclic compounds.
    Type: Grant
    Filed: August 28, 1987
    Date of Patent: November 28, 1989
    Assignee: GAF Corporation
    Inventors: Robert B. Login, Ratan K. Chaudhuri, David J. Tracy, Michael W. Helioff
  • Patent number: 4848377
    Abstract: An article of manufacture comprising an absorbent hair wrapping material coated or impregnated with a hair structure altering, water soluble solution and the process of employing the wrapping. The hair wrapping material is capable of retaining between about 5 and about 15 times its weight of water and a water soluble hair reducing lotion. The water soluble hair reducing lotion contains one of an N--C.sub.8 to C.sub.22 alkyl lactam conditioner or an N-- quaternized amino lactam.
    Type: Grant
    Filed: October 8, 1987
    Date of Patent: July 18, 1989
    Assignee: GAF Corporation
    Inventors: Carmen D. Bires, Michael W. Helioff, Ratan K. Chaudhuri
  • Patent number: 4837013
    Abstract: The invention relates primarily to quaternized compounds having the formula ##STR1## wherein m is an integer having a value of from 1 to 4; R is alkylene having from 3 to 8 carbon atoms and is optionally substituted with C.sub.1 to C.sub.4 alkyl; R.sub.4 is alkylene having from 1 to 4 carbon atoms, phenyl or naphthyl optionally substituted with lower alkyl; Y is ##STR2## wherein R.sub.6 is hydrogen or lower alkyl; R.sub.7 is alkyl of from 1 to 30 carbon atoms; R.sub.2 and R.sub.3 are each independently selected from the group of --R.sub.4 --Y--R.sub.7 alkyl, alkyleneoxyalkyl, alkylhydroxy, aryl, aralkyl, aralkenyl, alkaryl, and alkyleneamidoalkyl radicals, said groups each having from 1 to 30 carbon atoms and at least one of R.sub.7, R.sub.2 and R.sub.3 having at least 8 carbon atoms and X.sup.-- is a chloride, bromide or iodide anion. The invention also relates to the preparation and use of said quaternized compounds.
    Type: Grant
    Filed: August 28, 1987
    Date of Patent: June 6, 1989
    Assignee: GAF Corporation
    Inventors: Robert B. Login, Ratan K. Chaudhuri, David J. Tracy, Michael W. Helioff
  • Patent number: 4834970
    Abstract: The invention relates primarily to quaternized compounds having the formula ##STR1## wherein m is an integer having a value of from 1 to 4; R is alkylene having from 3 to 8 carbon atoms and is optionally substituted with C.sub.1 to C.sub.4 alkyl; R.sub.1, R.sub.2 and R.sub.3 are each independently selected from the group of alkyl, alkyl oxide, alkylhydroxy, alkoxy, aryl, aralkyl, alkaryl, and alkyl amidoalkyl radicals, said groups each having from 1 to 30 carbon atoms and at least one of R.sub.1, R.sub.2 and R.sub.3 is a radical having from 8 to 30 carbon atoms; and X.sup.- is a chloride, bromide or iodide anion. The invention also relates to the preparation and use of said quaternized compounds.
    Type: Grant
    Filed: June 29, 1987
    Date of Patent: May 30, 1989
    Assignee: GAF Corporation
    Inventors: Robert B. Login, Ratan K. Chaudhuri, David J. Tracy, Michael W. Helioff
  • Patent number: 4830850
    Abstract: The invention relates primarily to quaternized compounds having the formula ##STR1## wherein m and p are each integers having a value of from 1 to 4; R is alkylene having from 3 to 8 carbon atoms and is optionally substituted with C.sub.1 to C.sub.4 alkyl; R.sub.1 is alkyl or alkenyl having from 1 to 30 carbon atoms; R.sub.2 and R.sub.3 are each independently selected from the group of --(CH.sub.2).sub.p OR.sub.1, alkyl, alkylhydroxy, aryl, aralkyl, aralkenyl, alkaryl, and alkylene amidoalkyl radicals, said R.sub.2 and R.sub.3 groups having from 1 to 30 carbon atoms and at least one of R.sub.1, R.sub.2 and R.sub.3 is a radical having from 8 to 30 carbon atoms; and X.sup.- is a chloride, bromide or iodide anion. The invention also relates to the preparation and use of said quaternized compounds.
    Type: Grant
    Filed: August 28, 1987
    Date of Patent: May 16, 1989
    Assignee: GAF Corporation
    Inventors: Robert B. Login, Ratan K. Chaudhuri, David J. Tracy, Michael W. Helioff
  • Patent number: 4808569
    Abstract: The invention relates to a quaternized fragrance extender having the formula ##STR1## wherein n is an integer having a value of from 1 to 3; R is alkylene containing from 3 to 6 carbon atoms and is optionally substituted with lower alkyl; R.sub.1 is alkyl containing from 8 to 22 carbon atoms; R.sub.2 and R.sub.3 are each independently alkyl containing from 1 to 22 carbon atoms and X.sup.- is an anion which quaternized compound is capable of complexing with volatile, odoriferous compounds of between 3 and 60 carbon atoms having an acidic hydrogen atom in its structure and to the complexed compound formed and the use of said complexed compound in perfume and other commercial products including cosmetics, cleaning agents, paints, soaps, deodorants, plastics and rubbers.
    Type: Grant
    Filed: October 22, 1987
    Date of Patent: February 28, 1989
    Assignee: GAF Corporation
    Inventors: Ratan K. Chaudhuri, Michael W. Helioff, Robert B. Login
  • Patent number: 4732990
    Abstract: The invention relates primarily to quaternized compounds having the formula ##STR1## wherein m is an integer having a value of from 1 to 4; R is alkylene having from 3 to 8 carbon atoms and is optionally substituted with C.sub.1 to C.sub.4 alkyl; R.sub.1, R.sub.2 and R.sub.3 are each independently selected from the group of alkyl, alkyl oxide, alkylhydroxy, alkoxy, aryl, aralkyl, alkaryl, and alkyl amidoalkyl radicals, said groups each having from 1 to 30 carbon atoms and at least one of R.sub.1, R.sub.2 and R.sub.3 is radical having from 8 to 30 carbon atoms; and X.sup.- is a chloride, bromide or iodide anion. The invention also relates to the preparation and use of said quaternized compounds.
    Type: Grant
    Filed: October 24, 1986
    Date of Patent: March 22, 1988
    Assignee: GAF Corporation
    Inventors: Robert B. Login, Ratan K. Chaudhuri, David J. Tracy, Michael W. Helioff
  • Patent number: 4719287
    Abstract: The extraction of water soluble antibiotics containing a phenolic or carboxylic group from an aqueous solution or fermentation broth using a N--C.sub.8 --C.sub.14 alkyl pyrrolidone extractant and the process involving the extraction of said antibiotic.
    Type: Grant
    Filed: February 12, 1987
    Date of Patent: January 12, 1988
    Assignee: GAF Corporation
    Inventors: Robert B. Login, Ratan K. Chaudhuri
  • Patent number: 4713463
    Abstract: The single stage process of reacting a lactam with an epihalohydrin in the presence of alkali metal hydroxide and between about 10.sup.-1 and about 10.sup.-4 molar concentration based on lactam of a phase transfer catalyst selected from the group of tetraalkyl ammonium hydrogen sulfate and tetraalkyl ammonium halide.
    Type: Grant
    Filed: October 24, 1986
    Date of Patent: December 15, 1987
    Assignee: GAF Corporation
    Inventors: Ratan K. Chaudhuri, Robert B. Login, David J. Tracy