| Patents for H04R 31 - Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor (5,050) |
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| 04/27/1994 | EP0594435A1 Speaker cone and process for production thereof |
| 04/23/1994 | CA2108592A1 Speaker cone and process for production thereof |
| 04/13/1994 | EP0591152A1 Anti-infection catheter arrangement. |
| 03/30/1994 | EP0589396A2 Ultrasound transducer with improved rigid backing |
| 03/29/1994 | US5297553 Ultrasound transducer with improved rigid backing |
| 03/24/1994 | CA2106444A1 Ultrasound transducer with improved rigid backing |
| 03/08/1994 | US5293353 Method for manufacturing an acoustic sensor, and acoustic sensor obtained thereby, having a substantially non-detachable protective layer |
| 02/01/1994 | US5283027 Heating dies before mold; ressing cooling; releasing |
| 01/19/1994 | EP0579475A1 Vibration plate of a speaker and method for producing same |
| 12/28/1993 | US5274199 Acoustic diaphragm and method for producing same |
| 12/14/1993 | US5270676 Method of making elements of a magnetic circuit in a loudspeaker |
| 11/25/1993 | WO1993023966A1 Loudspeaker cone suspension rim having integral gasket |
| 11/02/1993 | US5259036 Diaphragm for dynamic microphones and methods of manufacturing the same |
| 10/14/1993 | WO1993020667A1 Noise cancelling transducer |
| 09/21/1993 | CA2017185C Method of making a variable capacitor microphone |
| 09/16/1993 | WO1993018627A1 Electret microphone assembly, and method of manufacture |
| 07/22/1993 | WO1993014608A1 Method and apparatus for making a loudspeaker cone and surround assembly |
| 07/21/1993 | EP0552040A1 Method and apparatus for making a loudspeaker cone and surround assembly |
| 06/24/1993 | DE4142455A1 Loudspeaker prodn. for increasing acoustic pressure or giving determined resonant response - comprises bonding metallised piezoceramic disc to metal carrier plate with non-conductive adhesive contg. filler with specified viscosity |
| 05/11/1993 | US5210805 Transducer flux optimization |
| 04/27/1993 | US5205897 Curing adhesion primer to improve bonding between device and adhesive |
| 04/27/1993 | CA2011690C Microphones |
| 03/09/1993 | US5191697 Loudspeaker damper and method of manufacturing the same |
| 02/02/1993 | US5182846 Process for producing a diaphragm for acoustic appliances |
| 01/19/1993 | US5180785 Diaphragm and method for producing same |
| 01/13/1993 | EP0522352A2 Process for bonding the moving coil carrier with the membrane of a loudspeaker |
| 01/12/1993 | US5178804 Thermally graphitizing film of aromatic polyimide or polyamide or polyoxadiazole and simultaneously pressure molding film into dome or cone at high temperature |
| 11/19/1992 | EP0513667A1 Acoustic diaphragm and method for producing same |
| 10/14/1992 | EP0508596A1 Electroacoustical transducer |
| 10/07/1992 | EP0507655A1 Method of production of a diaphragm with high internal loss and high rigidity for an electrodynamic loudspeaker |
| 10/06/1992 | US5152938 Process for preparation of a wholly carbonaceous diaphragm for acoustic equipment use |
| 09/30/1992 | CA2062277A1 Electroacoustical transducing |
| 09/22/1992 | US5149486 Method for manufacturing speaker vibration member |
| 09/22/1992 | US5149470 Graphite crystals in binder |
| 09/01/1992 | US5144186 Ultrasonic sandwich transducer with an astigmatic sonic lobe |
| 08/19/1992 | EP0499237A2 Electret capacitor microphone and method for the assembly |
| 08/12/1992 | EP0498015A1 Process for manufacturing ultrasonic transducers |
| 08/04/1992 | US5135582 Method for forming a diaphragm and diaphragm |
| 07/01/1992 | EP0492914A2 Loudspeaker cone and surround assembly |
| 06/30/1992 | US5125473 Speaker damper configuration |
| 06/21/1992 | CA2058131A1 Loudspeakers |
| 05/05/1992 | US5111510 Speaker and manufacturing method therefor |
| 05/05/1992 | US5111101 Device for magnifying displacement of piezoelectric element and method of producing the same |
| 04/08/1992 | EP0479317A2 Method of manufacturing a loudspeaker damper and loudspeakerdämper resulting from such method |
| 04/01/1992 | EP0477575A1 Ultrasonic converter, in particular for air and gas flow measurement, and process of manufacturing the same |
| 03/31/1992 | US5099949 Speaker and manufacturing method therefor |
| 03/26/1992 | CA2052034A1 Us transducer for air and gas flow measurement and a method for the manufacture thereof |
| 02/06/1992 | WO1992002108A1 Method for preparing membranes for acoustic applications in particular for loudspeakers, and membranes obtained by such method |
| 02/06/1992 | CA2087432A1 Method for preparing membranes for acoustic applications in particular for loudspeakers and membranes obtained by sudh method |
| 01/29/1992 | EP0468524A2 Method of manufacturing acoustic diaphragm |
| 01/14/1992 | US5080743 Process for preparation of a wholly carbonaceous diaphragm for acoustic equipment use |
| 11/21/1991 | EP0457474A2 Method of producing an acoustic diaphragm |
| 11/12/1991 | US5064019 Pyrolytic graphite film with discontinuous resin layer; high strength |
| 10/15/1991 | US5056204 Method of producing hearing aids |
| 09/18/1991 | EP0446515A2 Dynamic microphone and method of making the same |
| 08/28/1991 | CN1013726B Loudspeaker |
| 08/27/1991 | US5043185 Method for fabricating a graphite film for use as an electroacoustic diaphragm |
| 08/21/1991 | CN1013635B Loudspeaker |
| 08/13/1991 | US5038459 Method of fabricating the diaphragm unit of a condenser microphone by electron beam welding |
| 07/16/1991 | US5033093 Compact microphone and method of manufacture |
| 06/26/1991 | EP0433704A2 Loudspeaker housing case |
| 05/16/1991 | WO1991006329A1 Anti-infection catheter arrangement |
| 05/08/1991 | EP0425716A1 Ultrasonic layered transducer with astigmatic sound lobe |
| 05/07/1991 | US5014322 Diaphragm unit of a condenser microphone, a method of fabricating the same, and a condenser microphone |
| 05/02/1991 | EP0424936A2 High-temperature resistant piezoelectric transducer and process for production thereof |
| 05/02/1991 | EP0424841A2 Speaker diaphragm and method for making it |
| 03/13/1991 | EP0416551A2 Method of producing a displacement device |
| 01/29/1991 | US4989254 Electro-acoustic transducer and manufacturing process |
| 01/23/1991 | EP0409144A1 Speaker diaphragm and process for producing the same |
| 01/22/1991 | US4987002 Process for forming a crystalline diamond film |
| 01/16/1991 | EP0408328A2 Ultra-drawn polyethylene fibre reinforced composite material and method of manufacturing same |
| 01/14/1991 | CA2021021A1 Ultra-drawn polyethylene fiber reinforced composite material |
| 01/09/1991 | EP0406832A2 Method of manufacturing an acustic diaphragm |
| 12/13/1990 | DE3918774A1 Verfahren zur herstellung eines diaphragmas fuer einen lautsprecher aus voll kohlenstoffhaltigen materialien Process for the manufacture of a diaphragm for a speaker of fully carbonaceous materials |
| 12/06/1990 | DE3917006A1 Diaphragm for acoustic device based on boron-doped carbon materials - by heating mixt. of boron cpd., graphite and resins to high temp. to disperse dopant and orient graphite |
| 12/04/1990 | US4975318 Improved acoustic carbon diaphragm |
| 11/22/1990 | EP0398237A2 Method for manufacturing hearing aids |
| 11/22/1990 | EP0397975A2 Method of making a variable capacitor microphone |
| 11/14/1990 | EP0397621A2 Movable-coil electrodynamic transducer with a diaphragm |
| 11/11/1990 | CA2016478A1 Movable-coil electrodynamic transducer diaphragm |
| 11/01/1990 | WO1990012658A1 Process for manufacturing an acoustic sensor with an essentially non-detachable protective layer, and acoustic sensor so obtained |
| 10/25/1990 | DE4005849A1 Konuslautsprecher Cone speaker |
| 10/10/1990 | CN2063727U Heater for loudspeaker soft elements |
| 09/25/1990 | US4959185 Process for producing acoustic carbon diaphragm |
| 09/13/1990 | DE3907660A1 Process for the production of a diaphragm made of fully carbon-containing materials for an acoustic unit |
| 08/09/1990 | DE4001059A1 Prepn. of wholly carbon membrane for acoustic use - by calcining mixt. of graphite powder, resin contg. chlorine, monomer or prim. condensate contg. triazine ring, and solvent or plasticiser |
| 07/11/1990 | EP0377262A2 A compact and efficient sub-woofer system and method for installation in structural partitions |
| 07/11/1990 | EP0377171A2 Loudspeaker with plug-in connecting leads |
| 07/05/1990 | CA2002593A1 Compact and efficient sub-woofer system and method for installation in structural partitions |
| 07/03/1990 | US4938829 Process of making a diaphragm of vitreous hard carbonaceous material for an acoustic device |
| 06/07/1990 | DE3840705A1 Diaphragma fuer ein akustisches geraet Geraet diaphragm for an acoustic |
| 05/23/1990 | EP0369434A2 Speaker damper configuration |
| 05/15/1990 | US4924963 Compact and efficient sub-woofer system and method for installation in structural partitions |
| 05/01/1990 | US4921559 Process of making an acoustic carbon diaphragm |
| 04/24/1990 | US4919859 Process of making an acoustic carbon diaphragm |
| 03/28/1990 | EP0360172A2 Method for joining two casing parts elastically to each other and the joint produced by the method |
| 03/28/1990 | CN1040902A Loudspeaker |
| 03/28/1990 | CN1040901A Loudspeaker |
| 02/20/1990 | US4903300 Compact and efficient sub-woofer system and method for installation in structural partitions |
| 01/25/1990 | DE3824140A1 Fixing and electrical bonding of piezoceramics |