Granted Patent
Utility
US 4,488,451 · App. 06/359,573
Integral hand knob gear
Inventors:
Karl H. Ligensa, Philip Cherdron
Patented Case
View Patent ↗
Granted: Dec 18, 1984
Filed: Feb 18, 1982
Inventors
Karl H. Ligensa
Philip Cherdron
Assignee (at issue)
Keiper U.S.A. 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.