Granted Patent
Utility
US 4,956,554 · App. 07/302,716
Pyroelectric infra-red detectors and their method of manufacture
Inventors:
Geoffrey Baker, Roger Pearce, Paul L. Williamson
Patented Case
View Patent ↗
Granted: Sep 11, 1990
Filed: Jan 26, 1989
Inventors
Geoffrey Baker
Roger Pearce
Paul L. Williamson
Assignee (at issue)
U.S. Philips 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.