| Patents for H04R 31 - Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor (5,050) |
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| 12/21/1982 | CA1138090A1 Method and device for controlling wrinkles in a vibratile diaphragm |
| 11/23/1982 | CA1136261A1 Loudspeaker and a method of producing the same |
| 10/05/1982 | US4352407 Diaphragms for acoustic instruments and method of producing the same |
| 09/28/1982 | US4351412 Diaphragm for acoustic instruments and method of manufacturing the same |
| 09/07/1982 | US4348342 Method for making electrodynamic loudspeakers having a planar diaphragm of expanded polystyrene |
| 06/29/1982 | CA1126851A1 Electret transducer backplate, electret transducer and method of making an electret transducer |
| 04/27/1982 | CA1122694A1 Telephone transducer assembly and method of making same |
| 04/07/1982 | EP0048900A1 Process for the production of focussing piezoelectric resonators |
| 01/26/1982 | US4312118 Method for producing speaker construction |
| 12/02/1981 | EP0040948A1 Method of making an electro dynamic transducer |
| 10/13/1981 | CA1110751A1 Loudspeaker with single layer rectangular wire voice coil wound on slit metal bobbin with a notch in the adjacent pole plate |
| 09/29/1981 | US4291781 Polyethylene and carbon fibers |
| 07/07/1981 | CA1104706A1 Dynamic loudspeaker with plastic basket encapsulating front pole plate |
| 06/23/1981 | CA1103796A1 Microphone capable of cancelling mechanical generated noise |
| 06/09/1981 | US4272653 Loudspeaker and a method of producing the same |
| 04/07/1981 | CA1098774A1 Acoustic diaphragm with polyurethane elastomer coating |
| 03/03/1981 | US4254184 Vibrating member for acoustic transducer and method for manufacturing the same |
| 02/03/1981 | US4249043 Electret transducer backplate, electret transducer and method of making an electret transducer |
| 01/28/1981 | EP0023007A1 Method of making an electrodynamic transducer |
| 11/25/1980 | CA1090086A1 Method for producing a magnet plate for electroacoustic transducers |
| 09/09/1980 | US4221773 Blending and carbonizing graphite powder and thermoplastic resin |
| 07/29/1980 | US4215249 Method and device for controlling wrinkles in a vibratile diaphragm |
| 04/01/1980 | US4196022 Diffusion in an alkali metal atmosphere |
| 03/18/1980 | US4193647 Piezoelectric ceramic transducers with uniform resonant frequency |
| 03/04/1980 | US4191865 Loudspeaker padring and method of making the same |
| 03/04/1980 | US4190937 Method of manufacturing electroacoustic transducer elements which operate in the vicinity of resonance |
| 02/26/1980 | US4190782 Piezoelectric ceramic resonant transducer with stable frequency |
| 01/29/1980 | CA1070856A1 Method of making a transducer |
| 12/25/1979 | US4180710 Adjustably positioned phasing plug |
| 06/19/1979 | US4158756 Dynamic loudspeaker with plastic basket encapsulating front pole plate |
| 06/13/1979 | EP0002363A1 Electret transducer and method of making an electret transducer |
| 03/13/1979 | US4144416 Unitary tuned port and loudspeaker frame |
| 03/13/1979 | US4143537 Method for the manufacture of loud speakers |
| 02/20/1979 | US4140203 Tetramethylene glycol, ethylene glycol, diphenylmethane diisocyanate/4,4*-/, polyetherurethane copolymers, frequency response, efficiency, tensile strength, loudspeakers |
| 02/06/1979 | CA1048088A1 Noise reduction device for a chain drive mechanism |
| 12/05/1978 | US4128138 Diaphragm for speaker |
| 11/28/1978 | US4127749 Microphone capable of cancelling mechanical generated noise |
| 09/05/1978 | US4112168 High stiffness speaker cone |
| 05/09/1978 | US4088917 Method and apparatus for the permanent polarization of piezoelectric bodies |
| 04/25/1978 | US4086450 Variable thickness cone for a dynamic speaker and quality control inspection method therefor |
| 01/31/1978 | US4070741 Method of making an electret acoustic transducer |
| 01/17/1978 | US4069401 Acoustical frictional resistance construction and apparatus for manufacturing an acoustical resistance and an associated magnetic system |
| 12/06/1977 | US4061890 Loudspeaker with single layer rectangular wire voice coil wound on slit metal bobbin with a notch in the adjacent pole plate |
| 08/16/1977 | US4042438 Method of assembling a diaphragm assembly for an electro-acoustic transducer |
| 06/14/1977 | US4029911 Electro-acoustic transducer and method of manufacturing such a transducer |
| 05/31/1977 | US4026384 Reconstituted mica acoustic diaphragm |
| 03/29/1977 | US4014091 Method and apparatus for an electret transducer |
| 10/12/1976 | US3984903 Method of spanning across a frame a high-molecular-weight piezoelectric element |
| 06/08/1976 | US3961378 Cone construction for loudspeaker |
| 05/04/1976 | US3953920 Method of making a transducer |