Granted Patent
Utility
US 5,121,975 · App. 07/697,307
Fail-safe photoelectric detector
Inventor:
Dean L. Dahnert
Patented Case
View Patent ↗
Granted: Jun 16, 1992
Filed: May 8, 1991
Inventor
Dean L. Dahnert
Assignee (at issue)
SPACESAVER 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.