Granted Patent
Utility
US 6,535,136 · App. 09/243,772
Proximity card detection system
Inventors:
Robert W. Rodenbeck, Roger Keith Russell, Michael L. Long
Patented Case
View Patent ↗
Granted: Mar 18, 2003
Filed: Feb 3, 1999
Inventors
Robert W. Rodenbeck
Roger Keith Russell
Michael L. Long
Assignee (at issue)
Best Lock 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.