Granted Patent
Utility
US 4,827,636 · App. 07/160,476
Trencher crumber assembly
Inventor:
Joseph L. Emming
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: Feb 25, 1988
Inventor
Joseph L. Emming
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.