Granted Patent
Utility
US 4,469,943 · App. 06/383,852
Pyroelectric detector
Inventor:
Andrew A. Turnbull
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Jun 1, 1982
Inventor
Andrew A. Turnbull
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.