Granted Patent
Utility
US 4,921,308 · App. 07/186,049
Mobile machine suspension system
Inventors:
Darrell A. Yelton, Richard S. Norland
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Apr 25, 1988
Inventors
Darrell A. Yelton
Richard S. Norland
Assignee (at issue)
Target Products Ltd.
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.