Granted Patent
Utility
US 4,545,290 · App. 06/564,990
Pressure cylinder
Inventor:
Walter G. Lieberman
Patented Case
View Patent ↗
Granted: Oct 8, 1985
Filed: Dec 23, 1983
Inventor
Walter G. Lieberman
Assignee (at issue)
Tolomatic, 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.