Granted Patent
Utility
US 6,766,878 · App. 10/305,472
Custom-moulded ear-plug, and process for producing a custom-moulded ear-plug device
Inventors:
Christoph Widmer, Hans Hessel, Markus Weidmann
Patented Case
View Patent ↗
Granted: Jul 27, 2004
Filed: Nov 27, 2002
Inventors
Christoph Widmer
Hans Hessel
Markus Weidmann
Assignee (at issue)
Phonak 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.