Granted Patent
Utility
US 4,564,205 · App. 06/638,445
Flexible step assembly
Inventors:
Dennis R. Shookman, Vergil P. Hendrickson
Patented Case
View Patent ↗
Granted: Jan 14, 1986
Filed: Sep 30, 1982
Inventors
Dennis R. Shookman
Vergil P. Hendrickson
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.