Granted Patent
Utility
US 4,622,022 · App. 06/773,523
Telescoping tubes for torque transmission
Inventors:
Harold R. Diffenderfer, George S. Rowley
Patented Case
View Patent ↗
Granted: Nov 11, 1986
Filed: Sep 6, 1985
Inventors
Harold R. Diffenderfer
George S. Rowley
Assignee (at issue)
Neapco Holdings LLC
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.