Granted Patent
Utility
US 4,381,870 · App. 06/239,971
Versatile cart apparatus
Inventor:
James M. Muellner
Patented Case
View Patent ↗
Granted: May 3, 1983
Filed: Mar 3, 1981
Inventor
James M. Muellner
Assignee (at issue)
Smarte Carte, 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.