Granted Patent
Utility
US 5,649,469 · App. 08/057,988
Stroke indicator for an air-operated combination diaphragm spring brake
Inventor:
William C. Pierce
Patented Case
View Patent ↗
Granted: Jul 22, 1997
Filed: May 5, 1993
Inventor
William C. Pierce
Assignee (at issue)
Nai Anchorlok, 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.