Granted Patent
Utility
US 4,245,069 · App. 05/973,818
Polysiloxane composition
Inventor:
William S. Covington
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Dec 28, 1978
Inventor
William S. Covington
Assignee (at issue)
Permavision
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.