Granted Patent
Utility
US 5,626,331 · App. 08/582,312
Composite spindle
Inventor:
Ronald D. Erwin
Patented Case
View Patent ↗
Granted: May 6, 1997
Filed: Jan 3, 1996
Inventor
Ronald D. Erwin
Assignee (at issue)
Erwin Industries, 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.