Granted Patent
Utility
US 5,143,114 · App. 07/659,820
Ball valve lockout mechanism
Inventor:
Keith Daniels
Patented Case
View Patent ↗
Granted: Sep 1, 1992
Filed: Feb 25, 1991
Inventor
Keith Daniels
Assignee (at issue)
GTE Valenite Corporation
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.