Granted Patent
Utility
US 6,799,600 · App. 10/162,374
Protective metal housing for plastic air admittance valve
Inventor:
Calvin P. O'Neal
Patented Case
View Patent ↗
Granted: Oct 5, 2004
Filed: Jun 4, 2002
Inventor
Calvin P. O'Neal
Assignee (at issue)
IPS Group 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.