Patents by Inventor Clifton Leroy Kehr

Clifton Leroy Kehr 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).

  • Urethane polythiols
    Patent number: 4045472
    Abstract: The novel urethane polythiols of this invention are prepared by reacting: (a) a mono-, di-, or trihydric polythiol with a polymeric isocyanate; or (b) a di- or trihydric polythiol with a diisocyanate.
    Type: Grant
    Filed: December 15, 1975
    Date of Patent: August 30, 1977
    Assignee: W. R. Grace & Co.
    Inventors: James Leverette Guthrie, Clifton Leroy Kehr
  • Novel urethane polythiols
    Patent number: 3984456
    Abstract: A urethane polythiol, which can be a dithiol, is prepared by reacting a hydroxypolythiol, which can be a dithiol, with an isocyanate such as phenyl isocyanate, toluene diisocyanate, and the like.
    Type: Grant
    Filed: July 24, 1975
    Date of Patent: October 5, 1976
    Assignee: W. R. Grace & Co.
    Inventors: James Leverette Guthrie, Clifton Leroy Kehr
  • Novel urethane polythiols
    Patent number: 3981904
    Abstract: A urethane polythiol, which can be a dithiol, is prepared by reacting a hydroxypolythiol, which can be dithiol, with an isocyanate such as a phenyl isocyanate, toluene diisocyanate, and the like.
    Type: Grant
    Filed: July 24, 1975
    Date of Patent: September 21, 1976
    Assignee: W. R. Grace & Co.
    Inventors: James Leverette Guthrie, Clifton Leroy Kehr
  • Novel urethane polythiols
    Patent number: 3981901
    Abstract: A urethane polythiol, which can be a dithiol, is prepared by reacting a hydroxypolythiol, which can be a dithiol, with an isocyanate such as phenyl isocyanate, toluene diisocyanate, and the like.
    Type: Grant
    Filed: July 24, 1975
    Date of Patent: September 21, 1976
    Assignee: W. R. Grace & Co.
    Inventors: James Leverette Guthrie, Clifton Leroy Kehr