Granted Patent
Utility
US 4,237,612 · App. 06/024,990
Fastener grip length measuring system
Inventors:
Earl L. Christian, Ronald D. Blunck
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Mar 29, 1979
Inventors
Earl L. Christian
Ronald D. Blunck
Assignee (at issue)
General Dynamics 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.