Granted Patent
Utility
US 4,860,640 · App. 06/937,371
Air operated diaphragm spring brake
Inventor:
Nathan C. Ware
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Dec 3, 1986
Inventor
Nathan C. Ware
Assignee (at issue)
Neway Corp.
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.