Granted Patent
Utility
US 4,819,306 · App. 07/219,485
Swivel joint
Inventor:
Kazumi Kasai
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Jul 15, 1988
Inventor
Kazumi Kasai
Assignee (at issue)
Yoshida Kogyo K.K.
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.