Granted Patent
Utility
US 6,247,489 · App. 09/078,224
Check valve
Inventors:
Bruce W. Maskell, Gene L. Pecci
Patented Case
View Patent ↗
Granted: Jun 19, 2001
Filed: May 13, 1998
Inventors
Bruce W. Maskell
Gene L. Pecci
Assignee (at issue)
Jandy Industries 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.