Granted Patent
Utility
US 4,435,135 · App. 06/250,573
Pump assembly with improved seal
Inventor:
Michael G. Knickerbocker
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Apr 3, 1981
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.