Granted Patent
Utility
US 4,821,215 · App. 06/916,013
Monitoring equipment for adverse environments
Inventor:
Steven J. Woodward
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Oct 3, 1986
Inventor
Steven J. Woodward
Assignee (at issue)
Canadian Corporate Management Company Limited
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.