Granted Patent
Utility
US 4,523,740 · App. 06/484,385
Rotatable unitary ball valve
Inventor:
Harold Paitchell
Patented Case
View Patent ↗
Granted: Jun 18, 1985
Filed: Apr 12, 1983
Inventor
Harold Paitchell
Assignee (at issue)
Hayward Industries, 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.