Granted Patent
Utility
US 4,192,541 · App. 05/875,994
Cart having extensible auxiliary wheels
Inventor:
Richard H. Ferneau
Patented Case
View Patent ↗
Granted: Mar 11, 1980
Filed: Feb 8, 1978
Inventor
Richard H. Ferneau
Assignee (at issue)
Burt Weil
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.