Granted Patent
Utility
US 4,246,142 · App. 06/729,096
Vulcanizable semi-conductive compositions
Inventor:
Lucio Ongchin
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Oct 4, 1976
Inventor
Lucio Ongchin
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.