Granted Patent
Utility
US 6,818,881 · App. 09/464,546
Optical filter and passive infrared detector assembly
Inventors:
Nahum Chernichovski, Gidon Levin
Patented Case
View Patent ↗
Granted: Nov 16, 2004
Filed: Dec 15, 1999
Inventors
Nahum Chernichovski
Gidon Levin
Assignee (at issue)
VISONIC LTD.
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.