Granted Patent
Utility
US 4,904,005 · App. 07/272,992
Entrance security system
Inventor:
George Frolov
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Nov 18, 1988
Inventor
George Frolov
Assignee (at issue)
Harrow Products LLC
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.