Granted Patent
Utility
US 4,541,449 · App. 06/489,494
Gate valve
Inventors:
James Stanley Burke, David L. Miller, Edmund A. Fisher
Patented Case
View Patent ↗
Granted: Sep 17, 1985
Filed: Apr 28, 1983
Inventors
James Stanley Burke
David L. Miller
Edmund A. Fisher
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.