Granted Patent
Utility
US 4,431,083 · App. 06/262,059
Apparatus for lifting a member using parallelogram mounted links
Inventor:
Lyle E. York
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Oct 20, 1980
Inventor
Lyle E. York
Assignee (at issue)
Caterpillar Tractor Co.
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.