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Air gaps using a magnetic fluid

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  • H04R9/027
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HELECTRICITY H04Electric communication H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS DEAF-AID SETS PUBLIC ADDRESS SYSTEMS H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type

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H04R9/027Air gaps using a magnetic fluid
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Speaker
    • Patent number 12,219,339
    • Issue date Feb 4, 2025
    • AAC Microtech (Changzhou) Co., Ltd.
    • Hongjian Hu
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Speaker
    • Patent number 12,207,072
    • Issue date Jan 21, 2025
    • AAC Microtech (Changzhou) Co., Ltd.
    • Yang Shi
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Loudspeaker and earphone
    • Patent number 12,200,463
    • Issue date Jan 14, 2025
    • GOERTEK INC.
    • Xiaodong Guo
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Sound-producing apparatus, acoustic module provided with sound-prod...
    • Patent number 12,192,731
    • Issue date Jan 7, 2025
    • GOERTEK INC.
    • Lianshan Ge
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Sound device
    • Patent number 12,185,056
    • Issue date Dec 31, 2024
    • AAC Microtech (Changzhou) Co., Ltd.
    • Yang Shi
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Acoustic receivers with multiple diaphragms
    • Patent number 12,143,770
    • Issue date Nov 12, 2024
    • Knowles Electronics, LLC
    • Shehab Albahri
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Loudspeaker using semiconductor voice coil and electronic device us...
    • Patent number 12,143,794
    • Issue date Nov 12, 2024
    • TRANSOUND ELECTRONICS CO., LTD.
    • Tseng-Feng Wen
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Electrodynamic actuator for a speaker or a sound transducer with im...
    • Patent number 12,137,333
    • Issue date Nov 5, 2024
    • Sound Solutions International Co., Ltd.
    • Andreas Hintennach
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Loudspeaker and electronic apparatus
    • Patent number 12,108,233
    • Issue date Oct 1, 2024
    • BEIJING XIAOMI MOBILE SOFTWARE CO., LTD.
    • Xiulu Jin
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Loudspeaker with a fin-reinforced voice coil structure
    • Patent number 12,101,617
    • Issue date Sep 24, 2024
    • HAINING XIMINI TECHNOLOGY CO., LTD.
    • Wei Zhang
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Multifunctional sounding device
    • Patent number 12,088,996
    • Issue date Sep 10, 2024
    • AAC Microtech (Changzhou) Co., Ltd.
    • Xin Jin
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Speaker unit and speaker
    • Patent number 12,063,468
    • Issue date Aug 13, 2024
    • Sound Fun Corporation
    • Kazunori Sato
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Acoustic device and electronic apparatus
    • Patent number 12,041,400
    • Issue date Jul 16, 2024
    • GOERTEK INC.
    • Cuili Zhang
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Conductive film for a sound generation device and the sound generat...
    • Patent number 12,035,121
    • Issue date Jul 9, 2024
    • GoerTek Inc.
    • Xiaodong Guo
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Speaker
    • Patent number 12,003,917
    • Issue date Jun 4, 2024
    • AAC Microtech (Changzhou) Co., Ltd.
    • Hongjian Hu
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS
  • Information Patent Grant

    Integrated transducer
    • Patent number 11,985,493
    • Issue date May 14, 2024
    • Norman Gerkinsmeyer
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Speaker
    • Patent number 11,979,728
    • Issue date May 7, 2024
    • Alps Alpine Co., Ltd.
    • Hiroki Toita
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Bone conduction device including a balanced electromagnetic actuato...
    • Patent number 11,917,376
    • Issue date Feb 27, 2024
    • Cochlear Limited
    • Kristian Asnes
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Multi magnet electrodynamic acoustic transducer and electroacoustic...
    • Patent number 11,889,284
    • Issue date Jan 30, 2024
    • Sound Solutions International Co., Ltd.
    • Friedrich Reining
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Multi-input-driving loudspeaker
    • Patent number 11,882,423
    • Issue date Jan 23, 2024
    • SUZHOU RUSHENG ELECTRONICS CO., LTD.
    • Jianming Zhou
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Speaker
    • Patent number 11,863,931
    • Issue date Jan 2, 2024
    • AAC Microtech (Changzhou) Co., Ltd.
    • Tao Shao
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Speaker and electronic device
    • Patent number 11,856,384
    • Issue date Dec 26, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Keyong Zhou
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Acoustic receivers with multiple diaphragms
    • Patent number 11,832,054
    • Issue date Nov 28, 2023
    • Knowles Electronics, LLC
    • Shehab Albahri
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Speaker
    • Patent number 11,805,367
    • Issue date Oct 31, 2023
    • Alps Alpine Co., Ltd.
    • Hiroki Toita
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Speaker box
    • Patent number 11,800,267
    • Issue date Oct 24, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Bo Xiao
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Electromagnetic transducer with non-axial air gap
    • Patent number 11,778,385
    • Issue date Oct 3, 2023
    • Cochlear Limited
    • Tommy Bergs
    • B06 - GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
  • Information Patent Grant

    Sound production device and electronic apparatus therefor
    • Patent number 11,778,386
    • Issue date Oct 3, 2023
    • GoerTek Inc.
    • Xiaodong Guo
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Sound production unit and speaker
    • Patent number 11,765,517
    • Issue date Sep 19, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Tao Shao
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Speaker
    • Patent number 11,671,762
    • Issue date Jun 6, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Zhang Ren
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Speaker device
    • Patent number 11,638,074
    • Issue date Apr 25, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Xin Jin
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

  • Information Patent Application

    SPEAKER
    • Publication number 20240187793
    • Publication date Jun 6, 2024
    • ALPS ALPINE CO., LTD.
    • Ryo Ito
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    SPEAKER
    • Publication number 20240080623
    • Publication date Mar 7, 2024
    • AAC Microtech (Changzhou) Co., Ltd.
    • Yang Shi
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    Sound device
    • Publication number 20240073587
    • Publication date Feb 29, 2024
    • AAC Microtech (Changzhou) Co., Ltd.
    • Yang Shi
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    ACOUSTIC RECEIVERS WITH MULTIPLE DIAPHRAGMS
    • Publication number 20240064471
    • Publication date Feb 22, 2024
    • KNOWLES ELECTRONICS, LLC
    • Shehab Albahri
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    SPEAKER
    • Publication number 20240056742
    • Publication date Feb 15, 2024
    • AAC Microtech (Changzhou) Co., Ltd.
    • Yang Shi
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    LOUDSPEAKER USING SEMICONDUCTOR VOICE COIL AND ELECTRONIC DEVICE US...
    • Publication number 20240048912
    • Publication date Feb 8, 2024
    • TRANSOUND ELECTRONICS CO., LTD.
    • TSENG-FENG WEN
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    Multifunctional Sounding Device
    • Publication number 20230328427
    • Publication date Oct 12, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Xin Jin
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    LOUDSPEAKER
    • Publication number 20230319482
    • Publication date Oct 5, 2023
    • Panasonic Intellectual Property Management Co., Ltd.
    • Kazuma FUJIOKA
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    Speaker
    • Publication number 20230239608
    • Publication date Jul 27, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Hongjian Hu
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS
  • Information Patent Application

    LOUDSPEAKER AND EARPHONE
    • Publication number 20230224642
    • Publication date Jul 13, 2023
    • GOERTEK INC.
    • Xiaodong GUO
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    SPEAKER
    • Publication number 20230199372
    • Publication date Jun 22, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Tao Shao
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    SPEAKER
    • Publication number 20230199399
    • Publication date Jun 22, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Hongjian Hu
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    SOUND PRODUCTION UNIT AND SPEAKER
    • Publication number 20230199398
    • Publication date Jun 22, 2023
    • AAC MICROTECH (CHANGZHOU) CO., LTD.
    • Tao Shao
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    Speaker
    • Publication number 20230179921
    • Publication date Jun 8, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Wei Song
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    SPEAKER
    • Publication number 20230164491
    • Publication date May 25, 2023
    • ALPS ALPINE CO., LTD.
    • Hiroki Toita
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    SPEAKER BOX
    • Publication number 20230156383
    • Publication date May 18, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Bo Xiao
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    SPEAKER AND ELECTRONIC DEVICE
    • Publication number 20230148010
    • Publication date May 11, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Keyong Zhou
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    LOUDSPEAKER AND ELECTRONIC APPARATUS
    • Publication number 20230128831
    • Publication date Apr 27, 2023
    • Beijing Xiaomi Mobile Software Co., Ltd.
    • Xiulu JIN
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    ACOUSTIC RECEIVERS WITH MULTIPLE DIAPHRAGMS
    • Publication number 20230082965
    • Publication date Mar 16, 2023
    • KNOWLES ELECTRONICS, LLC
    • Shehab Albahri
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    ELECTRODYNAMIC ACTUATOR FOR A SPEAKER OR A SOUND TRANSDUCER WITH IM...
    • Publication number 20230071811
    • Publication date Mar 9, 2023
    • Sound Solutions International Co., Ltd.
    • Andreas Hintennach
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    SPEAKER
    • Publication number 20230031271
    • Publication date Feb 2, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Zhang Ren
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    SPEAKER
    • Publication number 20230033025
    • Publication date Feb 2, 2023
    • AAC Microtech (Changzhou) Co., Ltd.
    • Zhang Ren
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    LOUDSPEAKER WITH A FIN-REINFORCED VOICE COIL STRUCTURE
    • Publication number 20230019916
    • Publication date Jan 19, 2023
    • HAINING XIMINI TECHNOLOGY CO., LTD.
    • Wei Zhang
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    INTEGRATED TRANSDUCER
    • Publication number 20220394389
    • Publication date Dec 8, 2022
    • Norman Gerkinsmeyer
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    ACOUSTIC DEVICE AND ELECTRONIC APPARATUS
    • Publication number 20220369009
    • Publication date Nov 17, 2022
    • Goertek Inc.
    • CUILI ZHANG
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Application

    MULTI-INPUT-DRIVING LOUDSPEAKER
    • Publication number 20220369039
    • Publication date Nov 17, 2022
    • SUZHOU RUSHENG ELECTRONICS CO., LTD.
    • Jianming ZHOU
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    SOUND-PRODUCING APPARATUS, ACOUSTIC MODULE PROVIDED WITH SOUND-PROD...
    • Publication number 20220345824
    • Publication date Oct 27, 2022
    • Goertek Inc.
    • Lianshan Ge
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    CONDUCTIVE FILM FOR A SOUND GENERATION DEVICE AND THE SOUND GENERAT...
    • Publication number 20220345826
    • Publication date Oct 27, 2022
    • Goertek Inc.
    • Xiaodong GUO
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    SOUND PRODUCTION DEVICE AND ELECTRONIC APPARATUS THEREFOR
    • Publication number 20220329949
    • Publication date Oct 13, 2022
    • Goertek, Inc.
    • Xiaodong Guo
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    Multi Magnet Electrodynamic Acoustic Transducer and Electroacoustic...
    • Publication number 20220312122
    • Publication date Sep 29, 2022
    • Sound Solutions International Co., Ltd.
    • Friedrich Reining
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE