Granted Patent
Utility
US 4,867,423 · App. 07/237,676
Spring assembly having reinforced edge construction
Inventor:
John Marsh
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Aug 25, 1988
Inventor
John Marsh
Assignee (at issue)
Lear Siegler, Inc.
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.