Granted Patent
Utility
US 5,447,272 · App. 08/199,781
Automatic deicer spreader
Inventor:
Bernard J. Ask
Patented Case
View Patent ↗
Granted: Sep 5, 1995
Filed: Feb 22, 1994
Inventor
Bernard J. Ask
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.