Granted Patent
Utility
US 4,471,893 · App. 06/338,967
Valve assembly with integral plastic spring
Inventor:
Michael G. Knickerbocker
Patented Case
View Patent ↗
Granted: Sep 18, 1984
Filed: Jan 12, 1982
Inventor
Michael G. Knickerbocker
Assignee (at issue)
Seaquist 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.