Granted Patent
Utility
US 4,221,966 · App. 06/017,761
Infrared surveillance system
Inventors:
Howard S. Kerr, John R. Kettlewell, John B. Driffield, deceased, Margaret D. Driffield, administrator
Patented Case
View Patent ↗
Granted: Sep 9, 1980
Filed: Mar 5, 1979
Inventors
Howard S. Kerr
John R. Kettlewell
John B. Driffield, deceased
Margaret D. Driffield, administrator
Assignee (at issue)
Spar Aerospace 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.