Title:
In-ear hearing aid
United States Patent 2987584
US Patent References:
Hearing aid earpiece
- - 2430229
Dipole microphone
- - 2485405
Hearing aid
- - 2787670
Hearing aid embodied in spectacles
- - 2792457
Method of reducing secondary emission from bombarded surfaces
- - 2858466
Hearing aid earpiece
- - 2430229
Dipole microphone
- - 2485405
Hearing aid
- - 2787670
Hearing aid embodied in spectacles
- - 2792457
Method of reducing secondary emission from bombarded surfaces
- - 2858466
Inventors:
Webber, Melvyn E.
David, Skarzynski
Ulrich, Thomas F.
David, Skarzynski
Ulrich, Thomas F.
Publication Date:
06/06/1961
View Patent Images:
Export Citation:
Assignee:
Webber, Melvyn E.
David, Skarzynski
Ulrich, Thomas F.
David, Skarzynski
Ulrich, Thomas F.
Primary Class:
Other Classes:
381/328, 381/104, 381/321
International Classes:
H04R25/00; H04R25/02
Foreign References:
| GB737115A | ||||
| GB788099A |