Granted Patent
Utility
US 5,564,467 · App. 08/301,691
Poppet check valve
Inventor:
Rand H. Ackroyd
Patented Case
View Patent ↗
Granted: Oct 15, 1996
Filed: Sep 7, 1994
Inventor
Rand H. Ackroyd
Assignee (at issue)
Watts Investment Company
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.