Patents Represented by Attorney, Agent or Law Firm John A. Fortkort
  • Electret containing syndiotactic vinyl aromatic polymer
    Patent number: 5610455
    Abstract: Electrets are disclosed comprising syndiotactic vinyl aromatic polymer, for example syndiotactic polystyrene. These electrets have good charge retention at elevated temperature.
    Type: Grant
    Filed: June 29, 1995
    Date of Patent: March 11, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Richard C. Allen, Anthony F. Flannery, Charles R. Kleissler, David B. Redmond
  • Coated abrasive article
    Patent number: 5578095
    Abstract: A coated abrasive article is disclosed comprising a backing comprising an outermost layer of a paper-like polymeric film. Said film improves the slip-resistance of the article.
    Type: Grant
    Filed: November 21, 1994
    Date of Patent: November 26, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Ralph H. Bland, Joseph A. Fohrman, Raymond L. Lucking
  • Oil and water repellent compositions
    Patent number: 5536304
    Abstract: The invention relates to a water and oil repellency imparting composition which comprises:(a) a fluoroaliphatic radical-containing agent; and(b) a cyclic carboxylic anhydride-containing polysiloxane. Additionally, the composition may comprise:(c) an extender and/or a plasticizer. The composition provides water and oil repellent properties and a soft hand to fibrous and other substrates treated therewith.
    Type: Grant
    Filed: October 14, 1994
    Date of Patent: July 16, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Dirk M. Coppens, Kathy Allewaert
  • Treated substrate having improved release properties
    Patent number: 5492599
    Abstract: Treated cellulose-based substrate, e.g., paper, having improved release properties and methods of making such treated substrate are disclosed. The treated substrate is coated with a primer coating comprising a cationic polymer and with a release coating comprising a carboxy- or carboxylate-containing release polymer.
    Type: Grant
    Filed: May 18, 1994
    Date of Patent: February 20, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Christopher C. Olson, Ramesh C. Kumar, John C. Chang