Granted Patent
Utility
US 6,047,577 · App. 09/169,420
Abnormal use indicator for door lock
Inventor:
Frank Klimas
Patented Case
View Patent ↗
Granted: Apr 11, 2000
Filed: Oct 9, 1998
Inventor
Frank Klimas
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.