FR27790E - Improvements to receiving telephone devices - Google Patents

Improvements to receiving telephone devices

Info

Publication number: FR27790E
Authority: FR; France
Prior art keywords: telephone devices; receiving telephone; receiving; devices; telephone
Prior art date: 1923-02-26
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

Inventor

Joseph Bethenod

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.)

1923-03-20

Filing date

1923-02-26

Publication date

1924-08-18

1923-02-26 Application filed filed Critical

1924-08-18 Application granted granted Critical

1924-08-18 Publication of FR27790E publication Critical patent/FR27790E/en

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/02—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with tubes only
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
- H04R3/08—Circuits for transducers, loudspeakers or microphones for correcting frequency response of electromagnetic transducers

Landscapes

Engineering & Computer Science (AREA)
Physics & Mathematics (AREA)
Power Engineering (AREA)
Electromagnetism (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)

FR27790D 1923-03-20 1923-02-26 Improvements to receiving telephone devices Expired FR27790E (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
FR28302T		1923-03-20

Publications (1)

Publication Number	Publication Date
FR27790E true FR27790E (en)	1924-08-18

Family

ID=8666493

Family Applications (5)

Application Number	Title	Priority Date	Filing Date
FR569539D Expired FR569539A (en)	1923-03-20	1922-10-28	Improvements to receiving telephone devices
FR570201D Expired FR570201A (en)	1923-03-20	1922-11-14	Improvements to amplifying devices applicable in particular to corded or wireless telephony
FR27359D Expired FR27359E (en)	1923-03-20	1922-12-05	Improvements to receiving telephone devices
FR27790D Expired FR27790E (en)	1923-03-20	1923-02-26	Improvements to receiving telephone devices
FR28302D Expired FR28302E (en)	1923-03-20	1923-03-20	Improvements to amplifying devices applicable in particular to corded or wireless telephony

Family Applications Before (3)

Application Number	Title	Priority Date	Filing Date
FR569539D Expired FR569539A (en)	1923-03-20	1922-10-28	Improvements to receiving telephone devices
FR570201D Expired FR570201A (en)	1923-03-20	1922-11-14	Improvements to amplifying devices applicable in particular to corded or wireless telephony
FR27359D Expired FR27359E (en)	1923-03-20	1922-12-05	Improvements to receiving telephone devices

Family Applications After (1)

Application Number	Title	Priority Date	Filing Date
FR28302D Expired FR28302E (en)	1923-03-20	1923-03-20	Improvements to amplifying devices applicable in particular to corded or wireless telephony

Country Status (1)

Country	Link
FR (5)	FR569539A (en)

1922
- 1922-10-28 FR FR569539D patent/FR569539A/en not_active Expired
- 1922-11-14 FR FR570201D patent/FR570201A/en not_active Expired
- 1922-12-05 FR FR27359D patent/FR27359E/en not_active Expired
1923
- 1923-02-26 FR FR27790D patent/FR27790E/en not_active Expired
- 1923-03-20 FR FR28302D patent/FR28302E/en not_active Expired

Also Published As

Publication number	Publication date
FR28302E (en)	1925-02-16
FR27359E (en)	1924-06-24
FR570201A (en)	1924-04-25
FR569539A (en)	1924-04-14

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