Granted Patent
Utility
US 4,764,968 · App. 06/836,026
Disk diaphragm for a loudspeaker
Inventor:
Leonhard Kreitmeier
Patented Case
View Patent ↗
Granted: Aug 16, 1988
Filed: Mar 4, 1986
Inventor
Leonhard Kreitmeier
Assignee (at issue)
Standard Elektrik Lorenz AG
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.