Granted Patent
Utility
US 4,370,090 · App. 06/166,060
Boom lock
Inventors:
John F. Shumaker, Herman J. Maurer
Patented Case
View Patent ↗
Granted: Jan 25, 1983
Filed: Jul 7, 1980
Inventors
John F. Shumaker
Herman J. Maurer
Assignee (at issue)
J. I. Case 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.