Granted Patent
Utility
US 4,301,646 · App. 06/175,301
Defoliator
Inventors:
Donald C. Gates, Wayne S. Tonsfeldt
Patented Case
View Patent ↗
Granted: Nov 24, 1981
Filed: Aug 4, 1980
Inventors
Donald C. Gates
Wayne S. Tonsfeldt
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.