Granted Patent
Utility
US 4,271,723 · App. 05/949,590
Power train with an auxiliary creeper drive system
Inventor:
Walter M. Shaffer
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: Oct 10, 1978
Inventor
Walter M. Shaffer
Assignee (at issue)
Caterpillar Tractor Co.
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.