TREA

Telephone receivers

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  • H04R13/02
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HELECTRICITY H04Electric communication H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS DEAF-AID SETS PUBLIC ADDRESS SYSTEMS H04R13/00Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet

Current Industry

H04R13/02Telephone receivers
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Receiver
    • Patent number 11,617,049
    • Issue date Mar 28, 2023
    • SUZHOU SENSORFUN ELECTRONICS CO., LTD
    • Jianguang Wen
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Method for making diaphragm
    • Patent number 9,578,434
    • Issue date Feb 21, 2017
    • Tsinghua University
    • Jia-Ping Wang
    • B82 - NANO-TECHNOLOGY
  • Information Patent Grant

    Handset microphone
    • Patent number 9,282,404
    • Issue date Mar 8, 2016
    • Kabushiki Kaisha Audio Technica
    • Hiroshi Akino
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Portable telephone using bone conduction device
    • Patent number 7,512,425
    • Issue date Mar 31, 2009
    • Temco Japan Co., Ltd.
    • Mikio Fukuda
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Electromagnetic transducer and portable communication device
    • Patent number 7,187,779
    • Issue date Mar 6, 2007
    • Matsushita Electric Industrial Co., Ltd.
    • Sawako Usuki
    • B06 - GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
  • Information Patent Grant

    Electromagnetic sound producing device
    • Patent number 7,062,062
    • Issue date Jun 13, 2006
    • Citizen Electronics Co., Ltd.
    • Atsushi Kuwabara
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Electromagnetic transducer and portable communication device
    • Patent number 6,920,230
    • Issue date Jul 19, 2005
    • Matsushita Electric Industrial Co., Ltd.
    • Sawako Usuki
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Electromagnetic transducer and portable communication device
    • Patent number 6,671,383
    • Issue date Dec 30, 2003
    • Matsushita Electric Industrial Co., Ltd.
    • Sawako Usuki
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Electromagnetic transducer and portable communicating device
    • Patent number 6,658,133
    • Issue date Dec 2, 2003
    • Matsushita Electric Industrial Co., Ltd.
    • Sawako Usuki
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Electromagnetic electro-acoustic transducer
    • Patent number 6,600,400
    • Issue date Jul 29, 2003
    • Matsushita Electric Industrial Co., Ltd.
    • Kimihiro Andou
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS
  • Information Patent Grant

    Electroacoustic transducer
    • Patent number 5,923,769
    • Issue date Jul 13, 1999
    • Star Micronics Co., Ltd.
    • Isao Fushimi
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Small-sized sound generator
    • Patent number 5,721,785
    • Issue date Feb 24, 1998
    • Star Micronics Co., Ltd.
    • Yoshio Imahori
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Composition, processing and devices including magnetic alloy
    • Patent number 4,075,437
    • Issue date Feb 21, 1978
    • Bell Telephone Laboratories, Incorporated
    • Gilbert Yukyu Chin
    • C21 - METALLURGY OF IRON
  • Information Patent Grant

    3412219
    • Patent number 3,412,219
    • Issue date Nov 19, 1968
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2791641
    • Patent number 2,791,641
    • Issue date May 7, 1957
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2705263
    • Patent number 2,705,263
    • Issue date Mar 29, 1955
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2515414
    • Patent number 2,515,414
    • Issue date Jul 18, 1950
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2505519
    • Patent number 2,505,519
    • Issue date Apr 25, 1950
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2371453
    • Patent number 2,371,453
    • Issue date Mar 13, 1945
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2249158
    • Patent number 2,249,158
    • Issue date Jul 15, 1941
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2231084
    • Patent number 2,231,084
    • Issue date Feb 11, 1941
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2220942
    • Patent number 2,220,942
    • Issue date Nov 12, 1940
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2205669
    • Patent number 2,205,669
    • Issue date Jun 25, 1940
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2205670
    • Patent number 2,205,670
    • Issue date Jun 25, 1940
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2204529
    • Patent number 2,204,529
    • Issue date Jun 11, 1940
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2110200
    • Patent number 2,110,200
    • Issue date Mar 8, 1938
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2069817
    • Patent number 2,069,817
    • Issue date Feb 9, 1937
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1980242
    • Patent number 1,980,242
    • Issue date Nov 13, 1934
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1863308
    • Patent number 1,863,308
    • Issue date Jun 14, 1932
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1841469
    • Patent number 1,841,469
    • Issue date Jan 19, 1932
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents