Granted Patent
Utility
US 4,129,224 · App. 05/833,432
Automatic control of backhoe digging depth
Inventor:
Ted L. Teach
Patented Case
View Patent ↗
Granted: Dec 12, 1978
Filed: Sep 15, 1977
Inventor
Ted L. Teach
Assignee (at issue)
Laserplane Corporation
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.