Granted Patent
Utility
US 4,802,652 · App. 07/149,284
Tapered ball valve
Inventors:
Christopher P. Kaniut, Howard R. Dittmer
Patented Case
View Patent ↗
Granted: Feb 7, 1989
Filed: Jan 28, 1988
Inventors
Christopher P. Kaniut
Howard R. Dittmer
Assignee (at issue)
Rockwell International 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.