Granted Patent
Utility
US 6,146,280 · App. 08/536,654
Spring biased universal joint
Inventor:
Robert Pulford, Jr.
Patented Case
View Patent ↗
Granted: Nov 14, 2000
Filed: Sep 29, 1995
Inventor
Robert Pulford, Jr.
Assignee (at issue)
TRI-TECH CORPORATION
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.