Granted Patent
Utility
US 4,373,543 · App. 06/273,165
Fire resistant seat for flow control valve
Inventors:
Robert Joseph Brown, Kenneth Shepherd
Patented Case
View Patent ↗
Granted: Feb 15, 1983
Filed: Jun 12, 1981
Inventors
Robert Joseph Brown
Kenneth Shepherd
Assignee (at issue)
The Duriron Company, 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.