Granted Patent
Utility
US 4,552,544 · App. 06/453,077
Drive line slip joint assembly
Inventors:
John A. Beckman, David Sills
Patented Case
View Patent ↗
Granted: Nov 12, 1985
Filed: Dec 27, 1982
Inventors
John A. Beckman
David Sills
Assignee (at issue)
DANA LIMITED
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.