Granted Patent
Utility
US 4,716,665 · App. 07/005,499
Folding trencher boom
Inventors:
Richard Johnson, Stephen A. Youngers
Patented Case
View Patent ↗
Granted: Jan 5, 1988
Filed: Jan 20, 1987
Inventors
Richard Johnson
Stephen A. Youngers
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.