Granted Patent
Utility
US 5,377,579 · App. 08/078,734
Fluid-operated spring brake atuator with funnel-shaped pressure plate
Inventor:
William C. Pierce
Patented Case
View Patent ↗
Granted: Jan 3, 1995
Filed: Jun 15, 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.