GB1366159A - Hollow carbonaceous microspheres for use in carbon microphones - Google Patents

Hollow carbonaceous microspheres for use in carbon microphones

Info

Publication number
GB1366159A
GB1366159A GB5965871A GB5965871A GB1366159A GB 1366159 A GB1366159 A GB 1366159A GB 5965871 A GB5965871 A GB 5965871A GB 5965871 A GB5965871 A GB 5965871A GB 1366159 A GB1366159 A GB 1366159A
Authority
GB
United Kingdom
Prior art keywords
microspheres
dec
carbonaceous microspheres
aftertreated
hollow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB5965871A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kureha Corp
Original Assignee
Kureha Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kureha Corp filed Critical Kureha Corp
Publication of GB1366159A publication Critical patent/GB1366159A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Carbon And Carbon Compounds (AREA)
GB5965871A 1970-12-29 1971-12-22 Hollow carbonaceous microspheres for use in carbon microphones Expired GB1366159A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45120975A JPS4939015B1 (https=) 1970-12-29 1970-12-29

Publications (1)

Publication Number Publication Date
GB1366159A true GB1366159A (en) 1974-09-11

Family

ID=14799655

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5965871A Expired GB1366159A (en) 1970-12-29 1971-12-22 Hollow carbonaceous microspheres for use in carbon microphones

Country Status (4)

Country Link
US (1) US3835266A (https=)
JP (1) JPS4939015B1 (https=)
DE (1) DE2164691C3 (https=)
GB (1) GB1366159A (https=)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4952963U (https=) * 1972-08-15 1974-05-10
JPH02125764U (https=) * 1989-03-24 1990-10-17
ES2155741B1 (es) * 1998-04-03 2001-12-01 Consejo Superior Investigacion Fabricacion de granulos de carbono para su uso en microfonos.
CN106744783B (zh) * 2017-03-20 2018-12-25 福州大学 一种石墨化空心炭微球的制备方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2697136A (en) * 1951-04-28 1954-12-14 Bell Telephone Labor Inc Microphone and microphone granules
FR1458195A (fr) * 1965-05-31 1966-11-10 Charbonnages De France Microbilles de carbone et leur procédé de fabrication

Also Published As

Publication number Publication date
DE2164691C3 (de) 1979-10-31
DE2164691B2 (de) 1979-03-15
JPS4939015B1 (https=) 1974-10-22
DE2164691A1 (de) 1972-07-13
US3835266A (en) 1974-09-10

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLE Entries relating assignments, transmissions, licences in the register of patents
PCNP Patent ceased through non-payment of renewal fee