Granted Patent
Utility
US 4,535,967 · App. 06/568,460
Expanding gate valve with fluid-powered actuator
Inventors:
Brett A. Babbitt, Tri C. Le, Bruce P. Noble
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: Jan 5, 1984
Inventors
Brett A. Babbitt
Tri C. Le
Bruce P. Noble
Assignee (at issue)
Joy Manufacturing 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.