Granted Patent
Utility
US 4,074,448 · App. 05/697,037
Hinged snowplow, conversion kit, and method therefor
Inventor:
W. Wally Niemela
Patented Case
View Patent ↗
Granted: Feb 21, 1978
Filed: Jun 17, 1976
Inventor
W. Wally Niemela
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.