Granted Patent
Utility
US 4,271,857 · App. 06/063,157
Fire safe valve
Inventor:
Frederick Rowe
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: Aug 2, 1979
Inventor
Frederick Rowe
Assignee (at issue)
Cameron Iron Works, 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.