Granted Patent
Utility
US 4,113,200 · App. 05/701,504
Safety belt retractor with conjugate return spring means
Inventor:
Akira Tanaka
Patented Case
View Patent ↗
Granted: Sep 12, 1978
Filed: Jul 1, 1976
Inventor
Akira Tanaka
Assignee (at issue)
American Safety Equipment 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.