Granted Patent
Utility
US 6,529,607 · App. 09/856,692
Method for producing a constant sound pressure level in hearing aids and corresponding hearing aid
Inventors:
Ullrich Sigwanz, Frank Wagner
Patented Case
View Patent ↗
Granted: Mar 4, 2003
Filed: Nov 28, 2001
Inventors
Ullrich Sigwanz
Frank Wagner
Assignee (at issue)
Siemens Audiologische Technik GmbH
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.