Granted Patent
Utility
US 3,980,282 · App. 05/451,734
Material mixing apparatus
Inventors:
Elsward K. Burch, Pete B. Pedersen
Patented Case
View Patent ↗
Granted: Sep 14, 1976
Filed: Mar 18, 1974
Inventors
Elsward K. Burch
Pete B. Pedersen
Assignee (at issue)
Pettibone, LLC
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.