CH102427A - Perfectionnement apporté aux transmetteurs téléphoniques. - Google Patents

Perfectionnement apporté aux transmetteurs téléphoniques.

Info

Publication number: CH102427A
Authority: CH; Switzerland
Prior art keywords: improvement provided; telephone transmitters; transmitters; telephone; improvement
Prior art date: 1921-10-03

Application number

Other languages

English (en)

Inventor

Co Bell Telephon Manufacturing

Original Assignee

Bell Telephone Mfg

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.)

1921-10-03

Filing date

1922-08-28

Publication date

1923-12-01

1922-08-28 Application filed by Bell Telephone Mfg filed Critical Bell Telephone Mfg

1923-12-01 Publication of CH102427A publication Critical patent/CH102427A/fr

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/26—Damping by means acting directly on free portion of diaphragm or cone
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
- 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

Engineering & Computer Science (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)
Physics & Mathematics (AREA)
Multimedia (AREA)
Otolaryngology (AREA)
Health & Medical Sciences (AREA)
Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Diaphragms For Electromechanical Transducers (AREA)
Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Electrotherapy Devices (AREA)
Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Telephone Set Structure (AREA)
Vibration Prevention Devices (AREA)

CH102427D 1921-10-03 1922-08-28 Perfectionnement apporté aux transmetteurs téléphoniques. CH102427A (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US505059A US1583416A (en)	1921-10-03	1921-10-03	Vibration-responsive apparatus

Publications (1)

Publication Number	Publication Date
CH102427A true CH102427A (fr)	1923-12-01

Family

ID=24008826

Family Applications (2)

Application Number	Title	Priority Date	Filing Date
CH102427D CH102427A (fr)	1921-10-03	1922-08-28	Perfectionnement apporté aux transmetteurs téléphoniques.
CH102428D CH102428A (fr)	1921-10-03	1922-10-31	Dispositif amortisseur pour appareil à organe à mouvement vibratoire.

Family Applications After (1)

Application Number	Title	Priority Date	Filing Date
CH102428D CH102428A (fr)	1921-10-03	1922-10-31	Dispositif amortisseur pour appareil à organe à mouvement vibratoire.

Country Status (6)

Country	Link
US (2)	US1565581A (fr)
CH (2)	CH102427A (fr)
DE (1)	DE497111C (fr)
FR (3)	FR555456A (fr)
GB (3)	GB186896A (fr)
NL (2)	NL13005C (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
BE483732A (fr) *	1944-05-03
US2500541A (en) *	1945-07-18	1950-03-14	Emil H Greibach	Inertia-type electromechanical sound transducing device
US2527159A (en) *	1947-04-26	1950-10-24	Bell Telephone Labor Inc	Telephone transmitter with radial slots in the carbon chamber
US2567368A (en) *	1949-06-09	1951-09-11	Bell Telephone Labor Inc	Telephone transmitter

1921
- 1921-10-03 US US505060A patent/US1565581A/en not_active Expired - Lifetime
- 1921-10-03 US US505059A patent/US1583416A/en not_active Expired - Lifetime
1922
- 1922-07-03 NL NL22431A patent/NL13005C/xx active
- 1922-07-06 GB GB18572/22A patent/GB186896A/en not_active Expired
- 1922-08-28 FR FR555456D patent/FR555456A/fr not_active Expired
- 1922-08-28 CH CH102427D patent/CH102427A/fr unknown
- 1922-09-04 GB GB23945/22A patent/GB204859A/en not_active Expired
- 1922-09-07 NL NL22802A patent/NL13022C/xx active
- 1922-10-04 DE DEW62201D patent/DE497111C/de not_active Expired
- 1922-10-31 GB GB13568/27A patent/GB295751A/en not_active Expired
- 1922-10-31 FR FR27035D patent/FR27035E/fr not_active Expired
- 1922-10-31 CH CH102428D patent/CH102428A/fr unknown
1927
- 1927-06-14 FR FR33679D patent/FR33679E/fr not_active Expired

Also Published As

Publication number	Publication date
NL13005C (fr)	1925-05-15
US1565581A (en)	1925-12-15
FR555456A (fr)	1923-06-30
GB186896A (en)	1923-06-28
US1583416A (en)	1926-05-04
CH102428A (fr)	1923-12-01
NL13022C (fr)	1925-05-15
FR27035E (fr)	1924-03-26
DE497111C (de)	1930-05-02
FR33679E (fr)	1928-11-29
GB295751A (en)	1928-08-20
GB204859A (en)	1923-10-11

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