Granted Patent
Utility
US 4,425,857 · App. 06/358,069
Lock-up mechanism for a planter row unit
Inventors:
Darlo E. Lienemann, Donald L. Ledermann, Nicholas H. Wunschl
Patented Case
View Patent ↗
Granted: Jan 17, 1984
Filed: Mar 15, 1982
Inventors
Darlo E. Lienemann
Donald L. Ledermann
Nicholas H. Wunschl
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.