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| More topics under "H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; Deaf-aid sets; Public address systems" (141,872) |
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| H04R 1 - Details of transducers (42,173) | | H04R 11 - Transducers of moving-armature or moving-core type (1,828) | | H04R 13 - Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet (404) | | H04R 15 - Magnetostrictive transducers (423) | | H04R 17 - Piezo-electric transducers; Electrostrictive transducers (7,213) | | H04R 19 - Electrostatic transducers (5,387) | | H04R 21 - Variable-resistance transducers (174) | | H04R 23 - Transducers other than those covered by groups (1,562) | | H04R 25 - Deaf-aid sets (22,418) | | H04R 27 - Public address systems (2,454) | | H04R 29 - Monitoring arrangements; Testing arrangements (4,957) | | H04R 3 - Circuits for transducers (18,190) | | H04R 31 - Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor (5,050) | | H04R 5 - Stereophonic arrangements (11,598) | | H04R 7 - Diaphragms for electromechanical transducers; Cones (6,555) | | H04R 9 - Transducers of moving-coil, moving-strip, or moving-wire type (11,486) |
| Patents for H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; Deaf-aid sets; Public address systems (314) |
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| 10/20/1992 | WO1992019080A1 Improvements in and relating to transmission line loudspeakers | | 10/20/1992 | CA2108696A1 Improvements in and relating to transmission line loudspeakers | | 05/08/1992 | WO1992009181A1 Contact transducer assembly for hearing devices | | 05/08/1992 | CA2095432A1 Contact transducer assembly for hearing devices | | 11/21/1991 | EP0456968A2 Piezoelectric transducer | | 08/28/1991 | EP0442969A1 Wholly microfabricated biosensors and process for the manufacture and use thereof | | 04/18/1991 | WO1991006192A1 Soft sonar suspension system | | 04/18/1991 | CA2067242A1 Soft sonar suspension system | | 05/31/1990 | WO1990005910A1 Wholly microfabricated biosensors and process for the manufacture and use thereof | | 01/02/1986 | EP0165997A1 Sound reproduction system | | 06/06/1985 | WO1985002513A1 Sound reproduction system | | 02/12/1985 | US4498461 Coupling to a bone-anchored hearing aid | | 05/02/1984 | EP0106846A1 Coupling to a bone-anchored hearing aid | | 06/09/1983 | WO1983002047A1 Coupling to a bone-anchored hearing aid |
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