Granted Patent
Utility
US 4,722,392 · App. 06/846,290
Multiple position service seal unit with positive position indicating means
Inventors:
Lewis D. Proctor, Colby M. Ross, Brian P. Manzi, Frank Giusti, Jr.
Patented Case
View Patent ↗
Granted: Feb 2, 1988
Filed: Mar 31, 1986
Inventors
Lewis D. Proctor
Colby M. Ross
Brian P. Manzi
Frank Giusti, Jr.
Assignee (at issue)
Otis Engineering 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.