Patents by Inventor Johan E. DeWitte

Johan E. DeWitte 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).

  • Perfluoroalkyl halides and derivatives
    Patent number: 6365769
    Abstract: Novel mixtures of perfluoroalkyl halides and derivatives thereof are described. These mixtures contain some compounds with a straight perfluoroalkyl group and some with a branched perfluoroalkyl group. Methods of preparation and use are also described.
    Type: Grant
    Filed: February 15, 2000
    Date of Patent: April 2, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Frederick E. Behr, Rudolf J. Dams, Johan E. DeWitte, Donald F. Hagen
  • Substrate having high initial water repellency and a laundry durable water repellency
    Patent number: 6309752
    Abstract: Compositions comprising a fluorochemical agent, a copolymer extender, and a blocked isocyanate extender and substrates treated with such compositions that possess high initial water repellency and laundry durable water repellency.
    Type: Grant
    Filed: January 14, 1999
    Date of Patent: October 30, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: Rudolf J. Dams, Johan E. DeWitte, Christoffel C. Maes
  • Perfluoroalkyl halides and derivatives
    Patent number: 6048952
    Abstract: Novel mixtures of perfluoroalkyl halides and derivatives thereof are described. These mixtures contain some compounds with a straight perfluoroalkyl group and some with a branched perfluoroalkyl group. Methods of preparation and use are also described.
    Type: Grant
    Filed: February 4, 1997
    Date of Patent: April 11, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Frederick E. Behr, Rudolf J. Dams, Johan E. DeWitte, Donald F. Hagen
  • Perfluoroalkyl halides and derivatives
    Patent number: 5852148
    Abstract: Novel mixtures of perfluoroalkyl halides and derivatives thereof are described. These mixtures contain some compounds with a straight perfluoroalkyl group and some with a branched perfluoroalkyl group. Methods of preparation and use are also described.
    Type: Grant
    Filed: February 4, 1997
    Date of Patent: December 22, 1998
    Assignee: Minnesota Mining & Manufacturing Company
    Inventors: Frederick E. Behr, Rudolf J. Dams, Johan E. DeWitte, Donald F. Hagen