Granted Patent
Utility
US 4,335,071 · App. 06/194,690
Pressure-vacuum purge cycle
Inventor:
David Thornton
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Oct 6, 1980
Inventor
David Thornton
Assignee (at issue)
American Sterilizer Company
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.