Granted Patent
Utility
US 4,864,918 · App. 06/927,890
Thermoplastic diaphragm
Inventor:
Dieter Martin
Patented Case
View Patent ↗
Granted: Sep 12, 1989
Filed: Nov 7, 1986
Inventor
Dieter Martin
Assignee (at issue)
The Gates Rubber Company
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.