Granted Patent
Utility
US 4,887,794 · App. 07/266,001
Ball valve
Inventors:
John P. Oliver, Thomas F. Bright
Patented Case
View Patent ↗
Granted: Dec 19, 1989
Filed: Nov 2, 1988
Inventors
John P. Oliver
Thomas F. Bright
Assignee (at issue)
Mogas Industries, 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.