Patents Represented by Attorney, Agent or Law Firm William Ewert
  • Omega-hydrofluoroalkyl ethers, precursor carboxylic acids and derivatives thereof, and their preparation and application
    Patent number: 6491983
    Abstract: Normally liquid, omega-hydrofluoroalkyl ether compounds (and selected mixtures thereof) have a saturated perfluoroaliphatic chain of carbon atoms interrupted by one or more ether oxygen atoms. The compounds can be prepared, e.g., by decarboxylation of the corresponding fluoroalkyl ether carboxylic acids and are useful, e.g., in cleaning and drying applications.
    Type: Grant
    Filed: February 20, 2001
    Date of Patent: December 10, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: George G. I. Moore, Richard M. Flynn, Miguel A. Guerra, John G. Owens
  • Pressure-sensitive adhesive polyacrylate polymer microparticulate and method of making
    Patent number: 5952420
    Abstract: A pressure-sensitive adhesive polyacrylate polymer microparticulate obtainable by suspension polymerizing an aqueous mixture that comprises: (a) an acrylic acid ester of a nontertiary alcohol having 1 to 14 carbon atoms; (b) a polar monomer; (c) a styrene sulfonate salt; and (d) an amount of surfactant above the critical micelle concentration.
    Type: Grant
    Filed: October 7, 1997
    Date of Patent: September 14, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Raymond Senkus, Chung I. Young, Leonard W. Barrett, Ying-Yuh Lu