FR46765E - Perfectionnements à la téléphonie - Google Patents

Perfectionnements à la téléphonie

Info

Publication number: FR46765E
Authority: FR; France
Prior art keywords: telephony
Prior art date: 1933-12-30
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.)

LE TELEPHONE PRIVE NAT

Original Assignee

LE TELEPHONE PRIVE NAT

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.)

1933-12-30

Filing date

1935-04-17

Publication date

1936-09-11

1935-04-17 Application filed by LE TELEPHONE PRIVE NAT filed Critical LE TELEPHONE PRIVE NAT

1936-09-11 Application granted granted Critical

1936-09-11 Publication of FR46765E publication Critical patent/FR46765E/fr

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

Engineering & Computer Science (AREA)
Signal Processing (AREA)
Computer Networks & Wireless Communication (AREA)
Devices For Supply Of Signal Current (AREA)
Interconnected Communication Systems, Intercoms, And Interphones (AREA)

FR46765D 1933-12-30 1935-04-17 Perfectionnements à la téléphonie Expired FR46765E (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
FR449609X		1933-12-30

Publications (1)

Publication Number	Publication Date
FR46765E true FR46765E (fr)	1936-09-11

Family

ID=8900758

Family Applications (2)

Application Number	Title	Priority Date	Filing Date
FR789510D Expired FR789510A (fr)	1933-12-30	1934-08-03	Perfectionnements à la téléphonie
FR46765D Expired FR46765E (fr)	1933-12-30	1935-04-17	Perfectionnements à la téléphonie

Family Applications Before (1)

Application Number	Title	Priority Date	Filing Date
FR789510D Expired FR789510A (fr)	1933-12-30	1934-08-03	Perfectionnements à la téléphonie

Country Status (4)

Country	Link
US (1)	US2102903A (fr)
BE (1)	BE407035A (fr)
FR (2)	FR789510A (fr)
GB (1)	GB449609A (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE972766C (de) *	1941-12-14	1959-09-24	Normalzeit G M B H	Sprechanlage mit mehreren Stationen und zentralem Verstaerker
CH258989A (de) *	1942-12-04	1948-12-31	Autophon Ag	Anordnung zum Umschalten der Sprechrichtung in Wechselsprechanlagen für lautstarken Verkehr.
CH258725A (de) *	1942-12-21	1948-12-15	Autophon Ag	Ferneinschaltbarer Selbstanschluss-Fernsprecher für lautstarken Verkehr.
US2477275A (en) *	1944-01-15	1949-07-26	Firm Autophon Ag	Voice-controlled two-way communication system
US2427983A (en) *	1944-03-09	1947-09-23	Autophon Ag	Switching arrangement in duplex loud speaking systems
CH250532A (de) *	1944-10-21	1947-08-31	Autophon Ag	Anordnung in einer Wechselsprechanlage für lautstarken Verkehr.
US2451339A (en) *	1945-02-08	1948-10-12	Automatic Elect Lab	Intercommunicating system
US2427850A (en) *	1945-03-17	1947-09-23	Rca Corp	Switching method and system
US2584790A (en) *	1945-12-18	1952-02-05	Rca Corp	Switching circuit
US2694749A (en) *	1950-04-18	1954-11-16	Sepco 45 B D Sebastopol	Communication system
DE1020371B (de) *	1952-10-15	1957-12-05	Svenska Relaefab Ab	Wechselsprechanlage mit wahlweise durch die Sprechstroeme oder von Hand gesteuerter Umschaltung der Verkehrsrichtung
DE956693C (de) *	1953-03-19	1957-01-24	Telefunken Gmbh	Schaltungsanordnung fuer Gegensprechanlagen
US2819340A (en) *	1953-11-17	1958-01-07	Stanley S Brody	Voice operated intercommunication system
DE958935C (de) *	1954-02-08	1957-02-28	Telefunken Gmbh	Schaltungsanordnung fuer sprachgesteuerte Echo- und Rueckkopplungssperren in Gegensprechanlagen mit Lautsprecherbetrieb
DE1019706B (de) *	1954-12-14	1957-11-21	Svenska Relaefab Ab	Wechselsprechanlage mit wahlweise durch die Sprechstroeme oder von Hand gesteuerter Umschaltung der UEbertragungsrichtung
US3023273A (en) *	1957-09-25	1962-02-27	Liberman Arie	Communication system
US3439121A (en) *	1965-09-30	1969-04-15	Bell Telephone Labor Inc	Multiple channel loud-speaking telephone

1934
- 1934-08-03 FR FR789510D patent/FR789510A/fr not_active Expired
- 1934-12-24 GB GB36952/34A patent/GB449609A/en not_active Expired
- 1934-12-27 BE BE407035D patent/BE407035A/xx unknown
- 1934-12-27 US US759407A patent/US2102903A/en not_active Expired - Lifetime
1935
- 1935-04-17 FR FR46765D patent/FR46765E/fr not_active Expired

Also Published As

Publication number	Publication date
BE407035A (fr)	1935-01-30
US2102903A (en)	1937-12-21
GB449609A (en)	1936-06-24
FR789510A (fr)	1935-10-30

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