Granted Patent
Utility
US 4,273,502 · App. 06/021,265
Boom lock means
Inventors:
Herman J. Maurer, Wayne G. Smith
Patented Case
View Patent ↗
Granted: Jun 16, 1981
Filed: Mar 16, 1979
Inventors
Herman J. Maurer
Wayne G. Smith
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.