Granted Patent
Utility
US 5,640,148 · App. 08/592,799
Dual activation alarm system
Inventors:
R. David Lewis, Robert E. Gray, Bruce A. Hefner, Paul D. Hiltman
Patented Case
View Patent ↗
Granted: Jun 17, 1997
Filed: Jan 26, 1996
Inventors
R. David Lewis
Robert E. Gray
Bruce A. Hefner
Paul D. Hiltman
Assignee (at issue)
International Safety Instruments, Inc.
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.