FR20851E - Manufacture of freely standing arc-shaped heat conductors for thermal telephone - Google Patents

Manufacture of freely standing arc-shaped heat conductors for thermal telephone

Info

Publication number: FR20851E
Authority: FR; France
Prior art keywords: telephone; manufacture; thermal; shaped heat; heat conductors
Prior art date: 1915-02-08
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

Other languages

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.)

DE NL THERMO TELEPHOON MIJ NV

Original Assignee

DE NL THERMO TELEPHOON MIJ NV

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.)

1915-02-08

Publication date

1919-07-23

1919-07-23 Application granted granted Critical

1919-07-23 Publication of FR20851E publication Critical patent/FR20851E/en

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
- H04R23/002—Transducers other than those covered by groups H04R9/00 - H04R21/00 using electrothermic-effect transducer

Landscapes

Physics & Mathematics (AREA)
Engineering & Computer Science (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)
Resistance Heating (AREA)
Thermotherapy And Cooling Therapy Devices (AREA)
Adornments (AREA)
Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
Diaphragms For Electromechanical Transducers (AREA)

FR20851D 1915-02-08 Manufacture of freely standing arc-shaped heat conductors for thermal telephone Expired FR20851E (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
DE297246X		1915-02-08

Publications (1)

Publication Number	Publication Date
FR20851E true FR20851E (en)	1919-07-23

Family

ID=32831879

Family Applications (2)

Application Number	Title	Priority Date	Filing Date
FR20851D Expired FR20851E (en)	1915-02-08		Manufacture of freely standing arc-shaped heat conductors for thermal telephone
FR480855D Expired FR480855A (en)	1915-02-08	1916-02-04	Manufacture of freely standing arc-shaped heat conductors for thermal telephone

Family Applications After (1)

Application Number	Title	Priority Date	Filing Date
FR480855D Expired FR480855A (en)	1915-02-08	1916-02-04	Manufacture of freely standing arc-shaped heat conductors for thermal telephone

Country Status (4)

Country	Link
DE (2)	DE297246C (en)
FR (2)	FR480855A (en)
GB (2)	GB191505834A (en)
NL (2)	NL4793C (en)

0
- NL NL4050D patent/NL4050C/xx active
- DE DENDAT309415D patent/DE309415C/de active Active
- NL NL4793D patent/NL4793C/xx active
- FR FR20851D patent/FR20851E/en not_active Expired
1915
- 1915-02-08 DE DE1915297246D patent/DE297246C/de not_active Expired - Lifetime
- 1915-04-19 GB GB191505834D patent/GB191505834A/en not_active Expired
1916
- 1916-02-04 FR FR480855D patent/FR480855A/en not_active Expired
1918
- 1918-03-08 GB GB412018A patent/GB120507A/en not_active Expired

Also Published As

Publication number	Publication date
DE309415C (en)
NL4050C (en)
GB120507A (en)	1918-11-14
NL4793C (en)
DE297246C (en)
FR480855A (en)	1916-10-04
GB191505834A (en)	1916-04-19

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