Granted Patent
Utility
US 4,361,740 · App. 06/238,935
Seismic sensor apparatus
Inventor:
Roy Stockdale
Patented Case
View Patent ↗
Granted: Nov 30, 1982
Filed: Feb 27, 1981
Inventor
Roy Stockdale
Assignee (at issue)
NAPCO Security Systems, 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.