Granted Patent
Utility
US 6,563,933 · App. 09/708,638
Electromagnetic transducer for generating sound in hearing aids, particularly electronic hearing aids
Inventor:
Torsten Niederdraenk
Patented Case
View Patent ↗
Granted: May 13, 2003
Filed: Nov 9, 2000
Inventor
Torsten Niederdraenk
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.