Granted Patent
Utility
US 4,521,856 · App. 06/605,757
Multiple threshold wheel slip control apparatus and method
Inventors:
Weldon L. Phelps, Alan L. Stahl
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: May 1, 1984
Inventors
Weldon L. Phelps
Alan L. Stahl
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.