Granted Patent
Utility
US 4,528,903 · App. 06/558,038
Retractable wheel assembly for movable bolsters
Inventor:
Orville L. Lerch
Patented Case
View Patent ↗
Granted: Jul 16, 1985
Filed: Dec 5, 1983
Inventor
Orville L. Lerch
Assignee (at issue)
U.S. Industries, Inc.
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.