Granted Patent
Utility
US 4,553,609 · App. 06/517,549
Gang plow of varible working width
Inventor:
Henri E. Salva
Patented Case
View Patent ↗
Granted: Nov 19, 1985
Filed: Jul 27, 1983
Inventor
Henri E. Salva
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.