Granted Patent
Utility
US 4,747,145 · App. 06/934,126
Earcup suspension for headphone
Inventor:
Christopher Wiegel
Patented Case
View Patent ↗
Granted: May 24, 1988
Filed: Nov 24, 1986
Inventor
Christopher Wiegel
Assignee (at issue)
Telex Communications, 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.