Granted Patent
Utility
US 4,147,045 · App. 05/875,237
Combination lock with scrambler
Inventor:
Frank J. Testa
Patented Case
View Patent ↗
Granted: Apr 3, 1979
Filed: Feb 6, 1978
Inventor
Frank J. Testa
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.