Granted Patent
Utility
US 4,238,942 · App. 06/014,351
Direct dial combination lock with driver-cammed reciprocating tumblers and scrambled combs
Inventor:
Joseph J. Parrock
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Feb 23, 1979
Inventor
Joseph J. Parrock
Assignee (at issue)
The Mosler Safe 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.