Granted Patent
Utility
US 4,637,807 · App. 06/744,227
Split yoke universal joint
Inventor:
Robert Koelling
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Jun 13, 1985
Inventor
Robert Koelling
Assignee (at issue)
Morgan Construction 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.