Granted Patent
Utility
US 4,372,193 · App. 06/273,877
System with constant force actuator
Inventor:
Lowell R. Hall
Patented Case
View Patent ↗
Granted: Feb 8, 1983
Filed: Dec 24, 1980
Inventor
Lowell R. Hall
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.