Granted Patent
Utility
US 4,940,641 · App. 07/320,418
Aperture disc and method of making the same
Inventors:
Robert J. Pavone, Bruce L. Davidson, Henry F. Berdat
Patented Case
View Patent ↗
Granted: Jul 10, 1990
Filed: Mar 8, 1989
Inventors
Robert J. Pavone
Bruce L. Davidson
Henry F. Berdat
Assignee (at issue)
The Gerber Scientific Instrument 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.