Granted Patent
Utility
US 4,011,741 · App. 05/674,228
Lock cylinder with dual drivers
Inventor:
Roger J. Nolin
Patented Case
View Patent ↗
Granted: Mar 15, 1977
Filed: Apr 6, 1976
Inventor
Roger J. Nolin
Assignee (at issue)
TRE 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.