Granted Patent
Utility
US 4,223,462 · App. 06/033,454
Digging chain support for excavation
Inventor:
Marvin L. Morris
Patented Case
View Patent ↗
Granted: Sep 23, 1980
Filed: Apr 26, 1979
Inventor
Marvin L. Morris
Assignee (at issue)
J. I. Case Company
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.