Granted Patent
Utility
US 4,185,655 · App. 05/872,445
Submersible pump check valve
Inventors:
Robert D. Wilkes, Eugene C. Smith, David Earl Ufford
Patented Case
View Patent ↗
Granted: Jan 29, 1980
Filed: Jan 26, 1978
Inventors
Robert D. Wilkes
Eugene C. Smith
David Earl Ufford
Assignee (at issue)
Jacuzzi Brothers, 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.