Granted Patent
Utility
US 3,980,688 · App. 05/507,998
Polysiloxane-polyoxyalkylene block copolymers
Inventors:
Carl J. Litteral, David L. Mullins
Patented Case
View Patent ↗
Granted: Sep 14, 1976
Filed: Sep 20, 1974
Inventors
Carl J. Litteral
David L. Mullins
Assignee (at issue)
Union Carbide Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.