Granted Patent
Utility
US 4,527,594 · App. 06/597,838
Check valve
Inventor:
Richard P. Garneau
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Apr 9, 1984
Inventor
Richard P. Garneau
Assignee (at issue)
AFA 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.