Patents by Inventor Kevin X. Lettko

Kevin X. Lettko 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).

  • Silicone release coating compositions
    Patent number: 5177142
    Abstract: "Acrylic weld" of a silicone release composition comprising a polydiorganosiloxane containing unsaturated groups, a crosslinking agent containing Si--H groups and a hydrosilation catalyst is inhibited by incorporating therein at least one free radical inhibitor. The preferred inhibitors are alkoxyphenols, especially 4-methoxyphenol.
    Type: Grant
    Filed: August 22, 1991
    Date of Patent: January 5, 1993
    Assignee: General Electric Company
    Inventors: Judith Stein, Kevin X. Lettko
  • One part heat curable organopolysiloxane compositions
    Patent number: 5132442
    Abstract: Shelf stable heat curable mixtures of vinyl substituted organopolysiloxane fluid and siloxane hydride are provided. The one part polyorganosiloxane mixtures are catalyzed with an inclusion compound of a cyclodextrin and a complex of a cyclopentadiene, 1,5-cyclooctadiene or norbornadiene and a platinum group metal material, such as a C.sub.(1-4) alkyl substituted platinum or a rhodium halide.
    Type: Grant
    Filed: December 9, 1991
    Date of Patent: July 21, 1992
    Assignee: General Electric Company
    Inventors: Chris A. Sumpter, Larry N. Lewis, Kevin X. Lettko, Mark W. Davis
  • One part heat curable organopolysiloxane compositions
    Patent number: 5132385
    Abstract: Shelf stable heat curable mixtures of vinyl substituted organopolysiloxane fluid and siloxane hydride are provided. The one part polyorganosiloxane mixtures are catalyzed with an inclusion compound of a cyclodextrin and a complexing ligand such as, cyclopentadiene, 1,5-cyclooctadiene or norbornadiene and a platinum metal material, such as a C.sub.(1-4) alkyl substituted platinum.
    Type: Grant
    Filed: October 1, 1991
    Date of Patent: July 21, 1992
    Assignee: General Electric Company
    Inventors: Chris A. Sumpter, Larry N. Lewis, Kevin X. Lettko, Mark W. Davis
  • One part heat curable organopolysiloxane compositions
    Patent number: 5106939
    Abstract: Shelf stable heat curable mixtures of vinyl substituted organopolysiloxane fluid and siloxane hydride are provided. The one part polyorganosiloxane mixtures are catalyzed with an inclusion compound of a cyclodextrin and a complex of a cyclopentadiene, 1,5-cyclooctadiene or norbornadiene and a platinum group metal material, such as a C.sub.(1-4) alkyl substituted platinum or a rhodium halide.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: April 21, 1992
    Assignee: General Electric Company
    Inventors: Chris A. Sumpter, Larry N. Lewis, Kevin X. Lettko, Mark W. Davis