Granted Patent
Utility
US 4,335,894 · App. 06/156,890
Implement level lift system with rephasing valves
Inventor:
William C. Swanson
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: Jun 5, 1980
Inventor
William C. Swanson
Assignee (at issue)
International Harvester 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.