Patents by Inventor Steven T. Hedrick

Steven T. Hedrick 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: 6649727
    Abstract: The present invention relates to stable colloidal dispersions of sulfonated polyurethane ureas and self-supporting films formed from these dispersions. After formation of the sulfonated polyurethane urea, alcohols can be added to the aqueous dispersion to provide a water-alcohol system. The films of the present invention are minimally tacky and self-adhesive.
    Type: Grant
    Filed: July 27, 2000
    Date of Patent: November 18, 2003
    Assignee: 3M Innovative Properties Company
    Inventors: Jeffrey T. Anderson, Carol-Lynn Spawn, Steven T. Hedrick, Howard S. Creel, Steven S. Kantner
  • Patent number: 6165239
    Abstract: The present invention relates to stable aqueous colloidal dipersions of sulfopolyureas and self supporting films formed from the dispersions which display good mechanical properties from about room temperature to temperatures exceeding 150.degree. C. The films of the invention, which are formed with no volatile organic compound (VOC) emissions and no post-coating chemical or ionic cross-linking, are not redispersible in water and may be used to form heat resistant abrasive articles.
    Type: Grant
    Filed: July 28, 1997
    Date of Patent: December 26, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Steven T. Hedrick, Howard S. Creel, Subramanian Krishnan, John J. Stofko, Wayne K. Larson
  • Patent number: 6136890
    Abstract: Described are pigmented inks comprising a liquid medium, a pigment, and a polyurethane dispersant, the pigment being stabilized by the polyurethane dispersant, and the ink being suitable for use in an ink jet printer.
    Type: Grant
    Filed: February 17, 1998
    Date of Patent: October 24, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: James G. Carlson, Steven T. Hedrick, Richard J. Kuo, Jeffrey T. Anderson
  • Patent number: 5637368
    Abstract: An antistatic adhesive article which comprises an adhesive layer and utilizes vanadium oxide to impart antistatic properties to the article. The article is preferably an adhesive tape or sheet. The adhesive may be pressure sensitive or non-pressure sensitive. The vanadium oxide may be incorporated into or onto the tape from an aqueous dispersion.
    Type: Grant
    Filed: April 20, 1993
    Date of Patent: June 10, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: David A. Cadalbert, Eric D. Morrison, Tamara L. Johnson, William L. Kausch, David R. Boston, Wayne K. Larson, Steven T. Hedrick
  • Patent number: 5468498
    Abstract: Aqueous-based mixtures comprising colloidal vanadium oxide and a dispersed sulfonated polymer impart antistatic properties to coatings on a substrate and to self-supporting articles. The preferred colloidal vanadium oxide is alkoxide derived and provides mixed valence vanadium oxide wherein the vanadium ions are typically +4 and +5. Preferred sulfopolymers include sulfopolyesters, sulfopolyurethanes, sulfopolyurethanes/ureas, sulfopolyester polyols, and sulfopolyols. Antistatic composite structures comprising colloidal vanadium oxide and a sulfopolymer are also disclosed.
    Type: Grant
    Filed: March 20, 1995
    Date of Patent: November 21, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Eric D. Morrison, David R. Boston, Steven T. Hedrick, William L. Kausch, Wayne K. Larson, Simon S. Fung
  • Patent number: 5445866
    Abstract: A transparent recording sheet coated with a transparent water-based image-receptive coating composition of (1) from about 5 parts by weight to about 95 parts by weight of an oligomer incorporating at least one addition product having at least two reactants wherein one reactant is 3-glycidoxypropylalkoxysilane and the second reactant is at least one secondary amine; (2) from about 5 parts by weight to 95 parts by weight of a colloidal dispersion; (3) optionally, one or more anti-blocking agents; and (4) optionally, one or more surfactants.
    Type: Grant
    Filed: October 19, 1993
    Date of Patent: August 29, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert E. Martinson, John J. Stofko, Manisha Sarkar, Steven T. Hedrick, Wayne K. Larson
  • Patent number: 5427835
    Abstract: Aqueous-based mixtures comprising colloidal vanadium oxide and a dispersed sulfonated polymer impart antistatic properties to coatings on a substrate and to self-supporting articles. The preferred colloidal vanadium oxide is alkoxide derived and provides mixed valence vanadium oxide wherein the vanadium ions are typically +4 and +5. Preferred sulfopolymers include sulfopolyesters, sulfopolyurethanes, sulfopolyurethanes/ureas, sulfopolyester polyols, and sulfopolyols. Antistatic composite structures comprising colloidal vanadium oxide and a sulfopolymer are also disclosed.
    Type: Grant
    Filed: June 4, 1992
    Date of Patent: June 27, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Eric D. Morrison, David R. Boston, Steven T. Hedrick, William L. Kausch, Wayne K. Larson, Simon S. Fung
  • Patent number: 5203884
    Abstract: An abrasive article (i.e., a coated abrasive article or a three-dimensional, low density abrasive article) having a sufficient amount of vanadium oxide incorporated therein to provide having a reduced tendency to buildup static electricity during the abrading of a workpiece. Preferably, the abrasive article further comprises a compatible binder (preferably, a sulfonated polymer) to aid in securing the vanadium oxide to the abrasive article. In another aspect, a method of making the same is taught.
    Type: Grant
    Filed: June 4, 1992
    Date of Patent: April 20, 1993
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Scott J. Buchanan, Eric D. Morrison, David R. Boston, Steven T. Hedrick, William L. Kausch, Wayne K. Larson
  • Patent number: 4738992
    Abstract: A water-absorbing sponge comprises at least one of a pendent sulfo-group containing polyurea and polyurethane, the polymer containing at least one sulfonate equivalent per 20,000 molecular weight units.
    Type: Grant
    Filed: June 17, 1986
    Date of Patent: April 19, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Wayne K. Larson, Steven T. Hedrick
  • Patent number: 4638017
    Abstract: A water-absorbing sponge comprises at least one of a sulfo- group containing polyurea and polyurethane, the polymer containing at least one sulfonate equivalent per 20,000 molecular weight units.
    Type: Grant
    Filed: December 9, 1985
    Date of Patent: January 20, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Wayne K. Larson, Steven T. Hedrick