Granted Patent
Utility
US 5,158,264 · App. 07/660,348
Parallel expanding gate valve
Inventors:
Tri C. Le, Paul L. Tasson, Scott K. Beall
Patented Case
View Patent ↗
Granted: Oct 27, 1992
Filed: Feb 22, 1991
Inventors
Tri C. Le
Paul L. Tasson
Scott K. Beall
Assignee (at issue)
Baroid Technology, 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.