Patents by Inventor Ashok Sengupta
Ashok Sengupta 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).
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Patent number: 7459167Abstract: Polymeric compositions that include polyurethane polymers derived from a polyisocyanate compound and a polyactive hydrogen compound. The polyurethane compound is at least partially endcapped with a group including at least one antimicrobial quaternary ammonium compound. The polymeric composition of the present invention is capable of forming a self-supporting film. The polymeric compositions are suitable for coating substrates to effectively kill or prevent the growth of microorganisms such as bacteria, mold, mildew, algae fungi and the like. The polymeric compositions are particularly useful for protecting construction materials used in moist, outdoor environments to prevent discoloration or decay from microorganisms and for surfaces in health care facilities to mitigate the spread of pathogens.Type: GrantFiled: July 27, 2000Date of Patent: December 2, 2008Assignee: 3M Innovative Properties CompanyInventors: Ashok Sengupta, Jeffrey L. Jacobs, Matthew T. Scholz, Kestutis J. Tautvydas
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Patent number: 7290960Abstract: A liner is the product of reaction of (a) a hydrophilic prepolymer bearing isocyanate groups; and (b) a water-borne polymer dispersion, the polymer bearing groups that are reactive to isocyanate groups; wherein the dispersion has a sufficiently high solids content, and the polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that the product of reaction exhibits a 24-hour Tensile Strength of at least about 2.5 MPa.Type: GrantFiled: December 23, 2005Date of Patent: November 6, 2007Assignee: 3M Innovative Properties CompanyInventors: Ashok Sengupta, Jiangdong Tong
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Publication number: 20060099034Abstract: A liner is the product of reaction of (a) a hydrophilic prepolymer bearing isocyanate groups; and (b) a water-borne polymer dispersion, the polymer bearing groups that are reactive to isocyanate groups; wherein the dispersion has a sufficiently high solids content, and the polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that the product of reaction exhibits a 24-hour Tensile Strength of at least about 2.5 MPa.Type: ApplicationFiled: December 23, 2005Publication date: May 11, 2006Inventors: Ashok Sengupta, Jiangdong Tong
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Patent number: 7011865Abstract: A liner is the product of reaction of (a) a hydrophilic prepolymer bearing isocyanate groups; and (b) a water-borne polymer dispersion, the polymer bearing groups that are reactive to isocyanate groups; wherein the dispersion has a sufficiently high solids content, and the polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that the product of reaction exhibits a 24-hour Tensile Strength of at least about 2.5 MPa.Type: GrantFiled: September 6, 2002Date of Patent: March 14, 2006Assignee: 3M Innovative Properties CompanyInventors: Ashok Sengupta, Jiangdong Tong
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Patent number: 6664414Abstract: The invention provides a process for reducing the amount of monomeric polyisocyanate in a composition comprising a polymer or oligomer bearing isocyanate groups, the method comprising reacting the composition with a quenching agent, the quenching agent comprising an arylalkyl alcohol and an alkoxysilane bearing a secondary amino group.Type: GrantFiled: September 11, 2001Date of Patent: December 16, 2003Assignee: 3M Innovative Properties CompanyInventors: Jiangdong Tong, Ashok Sengupta
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Publication number: 20030125472Abstract: A liner is the product of reaction of (a) a hydrophilic prepolymer bearing isocyanate groups; and (b) a water-borne polymer dispersion, the polymer bearing groups that are reactive to isocyanate groups; wherein the dispersion has a sufficiently high solids content, and the polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that the product of reaction exhibits a 24-hour Tensile Strength of at least about 2.5 MPa.Type: ApplicationFiled: September 6, 2002Publication date: July 3, 2003Applicant: 3M Innovative Properties CompanyInventors: Ashok Sengupta, Jiangdong Tong
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Publication number: 20030092848Abstract: The invention provides a liner which is the product of reaction of a (a) hydrophilic prepolymer bearing isocyanate groups; and (b) a water-borne polyurethane dispersion, the polyurethane bearing groups that are reactive to isocyanate groups.Type: ApplicationFiled: September 11, 2001Publication date: May 15, 2003Inventors: Ashok Sengupta, Jiangdong Tong
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Publication number: 20030092932Abstract: The invention provides a process for reducing the amount of monomeric polyisocyanate in a composition comprising a polymer or oligomer bearing isocyanate groups, the method comprising reacting the composition with a quenching agent, the quenching agent comprising an arylalkyl alcohol and an alkoxysilane bearing a secondary amino group.Type: ApplicationFiled: September 11, 2001Publication date: May 15, 2003Inventors: Jiangdong Tong, Ashok Sengupta
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Patent number: 6432396Abstract: The present invention provides a method of limiting the presence of a microorganism by contacting the microorganism with polymer-bound metal-containing compositions. The compositions include metal-containing compounds that may be prepared by reacting or polymerizing metal-containing monomers. The microorganism may be present in a liquid that is contacted with the polymer-bound metal-containing composition. Alternatively, the microorganism may be present in a solid that is contacted with the polymer-bound metal-containing composition.Type: GrantFiled: July 6, 2000Date of Patent: August 13, 2002Assignee: 3M Innovative Properties CompanyInventors: Kevin D. Landgrebe, David J. Hastings, Terrance P. Smith, Gregory D. Cuny, Ashok Sengupta, Chandrika D. Mudalige, Frank A. Brandys
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Patent number: 6313335Abstract: Coatings are provided with very low surface energies provided by fluorine and/or silicone moieties. Aqueous dispersions of externally chain extended polyurethane compositions terminated by hydrolyzable and/or hydrolyzed silyl groups and containing dispersing or emulsifying groups, particularly carboxyl groups are provided. Also polyurethane dispersions which are substantially organic solvent free which cure to water and solvent resistant, tough, scratch resistant, preferably light stable polyurethane films are provided. Such films are useful as anti-fouling marine coatings. The compound RfR′fCFCOOCH2C(R)(CH2OH)2 is provided.Type: GrantFiled: November 25, 1997Date of Patent: November 6, 2001Assignee: 3M Innovative PropertiesInventors: Gary P. Roberts, Lowell W. Holland, Richard G. Hansen, Ashok Sengupta, George G. I. Moore, Miguel A. Guerra
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Patent number: 6248364Abstract: A process for encapsulating a partially water-miscible organic material within a polyurea or polyurethane shell is provided utilizing a water-soluble tertiary amine in the reaction dispersion. Microcapsules and methods of using microcapsules are also provided.Type: GrantFiled: April 7, 1997Date of Patent: June 19, 2001Assignee: 3M Innovative Properties CompanyInventors: Ashok Sengupta, Kent E. Nielsen, Galina Barinshteyn, Kai Li
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Patent number: 6080418Abstract: A composition comprising two suspensions: A) an aqueous suspension of microcapsules containing biologically active materials and B) an adhesive suspension of adhesive microspheres. The composition is useful for adhering microencapsulated biologically active material onto an intended substrate.Type: GrantFiled: April 7, 1997Date of Patent: June 27, 2000Assignee: 3M Innovative Properties CompanyInventors: Ashok Sengupta, Kent E. Nielsen, Galina Barinshteyn, Kai Li, John P. Banovetz
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Patent number: 6072019Abstract: The invention relates to novel water-soluble or water-dispersible polyurethane compounds and to compositions that contain the novel compounds and are useful, for instance, as low adhesion backsize for adhesive tapes. The invention also relates to processes for preparing the novel compounds, compositions and tapes.Type: GrantFiled: February 4, 1998Date of Patent: June 6, 2000Assignee: 3M Innovative Properties CompanyInventor: Ashok Sengupta
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Patent number: 6046295Abstract: This invention provides aqueous dispersions of externally chain extended polyurethane compositions terminated by hydrolyzable and/or hydrolyzed silyl groups and containing anionic solubilizing or emulsifying groups, particularly carboxyl groups. The invention also provides methods of making both anionically and cationically stabilized polyurethane dispersions. This invention further provides polyurethane dispersions which are substantially organic solvent free, (e.g. less than about 7 weight percent organic solvent) which cure to water and solvent resistant, tough, scratch resistant, preferably light stable (non-yellowing) polyurethane films. Such films are particularly useful as coatings for wood substrates, including wood floorings, furniture, and marine surfaces.Type: GrantFiled: August 30, 1996Date of Patent: April 4, 2000Assignee: 3M Innovative Properties CompanyInventors: Kurt C. Frisch, Jr., Bruce H. Edwards, Ashok Sengupta, Lowell W. Holland, Richard G. Hansen, Ian R. Owen
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Patent number: 5750630Abstract: The invention relates to novel water-soluble or water-dispersible polyurethane compounds and to compositions that contain the novel compounds and are useful, for instance, as low adhesion backsize for adhesive tapes. The invention also relates to processes for preparing the novel compounds, compositions and tapes.Type: GrantFiled: July 19, 1996Date of Patent: May 12, 1998Assignee: Minnesota Mining and Manufacturing CompanyInventor: Ashok Sengupta
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Patent number: 5554686Abstract: This invention provides aqueous dispersions of externally chain extended polyurethane compositions terminated by hydrolyzable and/or hydrolyzed silyl groups and containing anionic solubilizing or emulsifying groups, particularly carboxyl groups. The invention also provides methods of making both anionically and cationically stabilized polyurethane dispersions. This invention further provides polyurethane dispersions which are substantially organic solvent free (e.g. less than about 7 weight percent organic solvent) which cure to water and solvent resistant, tough, scratch resistant, preferably light stable (non-yellowing) polyurethane films. Such films are particularly useful as coatings for wood substrates, including wood floorings, furniture, and marine surfaces.Type: GrantFiled: November 13, 1995Date of Patent: September 10, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: Kurt C. Frisch, Jr., Bruce H. Edwards, Ashok Sengupta, Lowell W. Holland, Richard G. Hansen, Ian R. Owen