Granted Patent
Utility
US 4,377,979 · App. 06/249,397
Conservation tillage row crop planter system
Inventors:
Richard L. Peterson, James A. Johnson, Richard W. Steinberg, Roger J. Scheurer
Patented Case
View Patent ↗
Granted: Mar 29, 1983
Filed: Mar 31, 1981
Inventors
Richard L. Peterson
James A. Johnson
Richard W. Steinberg
Roger J. Scheurer
Assignee (at issue)
Hiniker 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.