Granted Patent
Utility
US 4,954,811 · App. 07/277,373
Penetration sensor
Inventors:
Joseph V. Chatigny, Peter Roland Smith
Patented Case
View Patent ↗
Granted: Sep 4, 1990
Filed: Nov 29, 1988
Inventors
Joseph V. Chatigny
Peter Roland Smith
Assignee (at issue)
Pennwalt 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.