Granted Patent
Utility
US 4,455,770 · App. 06/395,576
Trencher power control system
Inventor:
Glen T. Presley
Patented Case
View Patent ↗
Granted: Jun 26, 1984
Filed: Jul 6, 1982
Inventor
Glen T. Presley
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.