Granted Patent
Utility
US 4,489,576 · App. 06/589,349
Deadbolt assembly
Inventors:
Richard O. Mullich, Ray N. Dushane
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Mar 14, 1984
Inventors
Richard O. Mullich
Ray N. Dushane
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.