Granted Patent
Utility
US 5,921,501 · App. 08/446,976
Aircraft ice detecting system
Inventor:
Benjamin J. Pernick
Patented Case
View Patent ↗
Granted: Jul 13, 1999
Filed: May 22, 1995
Inventor
Benjamin J. Pernick
Assignee (at issue)
NORTHROP GRUMMAN 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.