Patents by Inventor Smarajit Mitra

Smarajit Mitra 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).

  • Polysiloxane-grafted copolymer non-pressure sensitive topical binder composition and method of coating therewith
    Patent number: 4981902
    Abstract: Disclosed is a novel composition which is a non-pressure-sensitive adhesive at room temperature (20.degree. C.) and which contains a copolymer which has pendant polysiloxane grafts. Also disclosed are applications to the hair or body of an animal containing the novel composition.
    Type: Grant
    Filed: August 7, 1989
    Date of Patent: January 1, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Smarajit Mitra, James E. Garbe
  • Polysiloxane-grafter copolymer topical binder composition with novel hydrophilic monomers and method of coating therewith
    Patent number: 4981903
    Abstract: A novel composition which can serve as a pressure-sensitive or non-pressure sensitive adhesive at room temperature (20.degree. C.) and which comprises a vinyl polymeric backbone with grafted pendant siloxane polymeric moieties. Also disclosed are topical binder compositions containing the novel composition.
    Type: Grant
    Filed: August 7, 1989
    Date of Patent: January 1, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: James E. Garbe, Smarajit Mitra
  • Polysiloxane-grafted copolymer topical binder composition with novel fluorochemical comonomer and method of coating therewith
    Patent number: 4972037
    Abstract: A novel composition useful as an adhesive at room temperature (20.degree. C.) and which comprises a copolymer which has both pendant fluorochemical groups and pendant polysiloxane grafts. Also disclosed are topical applications containing the novel composition.
    Type: Grant
    Filed: August 7, 1989
    Date of Patent: November 20, 1990
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: James E. Garbe, Steven S. Kantner, Kanta Kumar, Smarajit Mitra
  • Copolymerizable UV stabilizers
    Patent number: 4831109
    Abstract: This invention describes UV-stabilized step growth polymers such as polyesters, polyurethanes, polycarbonates, and combination thereof. The UV-stabilizing moieties present in these polymers comprise chemically bound, pendant ortho-hydroxydiphenyl ketone based moieties. The polymers are especially useful as protective films and fibers which are highly resistant to ultraviolet (UV) and sunlight degradation.
    Type: Grant
    Filed: June 2, 1987
    Date of Patent: May 16, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Sumita B. Mitra, Smarajit Mitra
  • Polymerizable compositions containing iodonium photoinitiators and photosensitizers therefor
    Patent number: 4792506
    Abstract: This invention describes the preparation of some new Mannich polymers and copolymers and teaches their general use as photosensitizers for onium salts for use in the initiation of free radical polymerization of vinyl monomers. These Mannich polymers are unexpectedly more efficient as photosensitizers than are the non-polymeric photosensitizers.
    Type: Grant
    Filed: September 19, 1986
    Date of Patent: December 20, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert J. Devoe, Smarajit Mitra
  • Photosensitizers and polymerizable compositions with mannich bases and iodonium salts
    Patent number: 4791045
    Abstract: This invention describes the use of some Mannich bases as photosensitizers for iodonium salts for use in the initiation of free radical polymerization of vinyl monomers. These Mannich bases are unexpectedly more efficient as photosensitizers than are the conventional photosensitizers.
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: December 13, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Smarajit Mitra, Robert J. DeVoe
  • Methacrylamide functional polymers and method
    Patent number: 4777217
    Abstract: A polymer comprises at least one methacrylamide functional group on the average per polymer molecule, which polymer comprises the reaction product of at least one hydroxy functional polymer with at least one isopropenyl azlactone in the presence of an acidic catalyst, said hydroxy functional polymer having a number average molecular weight above 20,000.
    Type: Grant
    Filed: February 26, 1987
    Date of Patent: October 11, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Jerald K. Rasmussen, Steven M. Heilmann, Larry R. Krepski, Smarajit Mitra
  • Copolymerizable UV stabilizers
    Patent number: 4691059
    Abstract: This invention describes UV-stabilized step growth polymers such as polyesters, polyurethanes, polycarbonates, and combinations thereof. The UV-stabilizing moieties present in these polymers comprise chemically bound, pendant ortho-hydroxydiphenyl ketone based moieties. The polymers are especially useful as protective films and fibers which are highly resistant to ultraviolet (UV) and sunlight degradation.
    Type: Grant
    Filed: August 30, 1985
    Date of Patent: September 1, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Sumita B. Mitra, Smarajit Mitra
  • Polymeric triarylmethane dyes
    Patent number: 4477635
    Abstract: Polymeric and copolymeric aminotriarylmethane dyes having polyester, polyethyleneimine, or polyurethane backbones, and a process for their preparation, are disclosed. The novel dyes are highly colored and resistant to leaching by solvents.
    Type: Grant
    Filed: January 4, 1982
    Date of Patent: October 16, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Smarajit Mitra
  • Transfer, encapsulating, and fixing of toner images
    Patent number: 4337303
    Abstract: A method of transferring, encapsulating, and fixing dried liquid toner images in electrography is provided. Stable, abrasion-resistant articles exhibiting continuous tone and transmission optical densities within the range of 0 to 4.0 are disclosed.
    Type: Grant
    Filed: August 11, 1980
    Date of Patent: June 29, 1982
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Melville R. V. Sahyun, Tsung-I Chen, Timothy W. King, Valdis Mikelsons, Smarajit Mitra