Granted Patent
Utility
US 5,992,462 · App. 09/182,575
Disc type check valve
Inventors:
Gordon E. Atkinson, James C. Bailey
Patented Case
View Patent ↗
Granted: Nov 30, 1999
Filed: Oct 28, 1998
Inventors
Gordon E. Atkinson
James C. Bailey
Assignee (at issue)
VERNAY LABORATORIES, 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.