Granted Patent
Utility
US 5,341,840 · App. 08/150,999
Bonnetless swing check valve
Inventors:
Ronald Manson, Charles C. Partridge
Patented Case
View Patent ↗
Granted: Aug 30, 1994
Filed: Nov 12, 1993
Inventors
Ronald Manson
Charles C. Partridge
Assignee (at issue)
Tom Wheatley 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.