Granted Patent
Utility
US 5,590,680 · App. 08/604,750
External valve operating means
Inventors:
Zbigniew Gugala, John N. Scapes
Patented Case
View Patent ↗
Granted: Jan 7, 1997
Filed: Feb 23, 1996
Inventors
Zbigniew Gugala
John N. Scapes
Assignee (at issue)
Henry Valve 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.