Granted Patent
Utility
US 4,958,670 · App. 07/475,133
Tree felling apparatus
Inventor:
Calvin S. Johnson
Patented Case
View Patent ↗
Granted: Sep 25, 1990
Filed: Feb 5, 1990
Inventor
Calvin S. Johnson
Assignee (at issue)
CTR Manufacturing, Inc.
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.