Granted Patent
Utility
US 4,244,398 · App. 06/067,438
Check valve assembly having valve opening prior to passing flow and flow shut off prior to valve closing
Inventor:
Alfred K. Tengan
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Aug 20, 1979
Inventor
Alfred K. Tengan
Assignee (at issue)
Moog 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.