Granted Patent
Utility
US 4,272,974 · App. 06/006,564
Dead bolt lock
Inventor:
Thomas Hennessy
Patented Case
View Patent ↗
Granted: Jun 16, 1981
Filed: Jan 25, 1979
Inventor
Thomas Hennessy
Assignee (at issue)
Lori Engineering 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.