Granted Patent
Utility
US 4,497,706 · App. 06/547,960
Oil filter relief valve
Inventors:
Charles G. Pickett, John G. Charney, Marra Khasin
Patented Case
View Patent ↗
Granted: Feb 5, 1985
Filed: Nov 2, 1983
Inventors
Charles G. Pickett
John G. Charney
Marra Khasin
Assignee (at issue)
PUROLATOR INC.
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.