FR519492A - Electrical communications system between stations - Google Patents

Electrical communications system between stations

Info

Publication number: FR519492A
Authority: FR; France
Prior art keywords: stations; communications system; electrical communications; electrical; communications
Prior art date: 1918-07-26
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

FR519492A

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.)

Thales SA

Original Assignee

Le Materiel Telephonique Thomson CSF

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.)

1918-07-26

Filing date

1918-12-31

Publication date

1921-06-10

1918-07-26 Priority claimed from US246910A external-priority patent/US1353031A/en

1918-12-31 Application filed by Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF

1921-06-10 Application granted granted Critical

1921-06-10 Publication of FR519492A publication Critical patent/FR519492A/en

Status Expired legal-status Critical Current

Links

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
- H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency

Landscapes

Engineering & Computer Science (AREA)
Computer Networks & Wireless Communication (AREA)
Devices For Supply Of Signal Current (AREA)
Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Interface Circuits In Exchanges (AREA)
Amplifiers (AREA)

FR519492A 1918-07-26 1918-12-31 Electrical communications system between stations Expired FR519492A (en)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
US246910A US1353031A (en)	1918-07-26	1918-07-26	Vacuum-bulb for signaling apparatus
US254974A US1371298A (en)	1918-07-26	1918-09-20	Telephone and call signal system

Publications (1)

Publication Number	Publication Date
FR519492A true FR519492A (en)	1921-06-10

Family

ID=26938320

Family Applications (3)

Application Number	Title	Priority Date	Filing Date
FR519492A Expired FR519492A (en)	1918-07-26	1918-12-31	Electrical communications system between stations
FR22613A Expired FR22613E (en)	1918-07-26	1919-10-14	Electrical communications system between stations
FR22688A Expired FR22688E (en)	1918-07-26	1920-01-08	Electrical communications system between stations

Family Applications After (2)

Application Number	Title	Priority Date	Filing Date
FR22613A Expired FR22613E (en)	1918-07-26	1919-10-14	Electrical communications system between stations
FR22688A Expired FR22688E (en)	1918-07-26	1920-01-08	Electrical communications system between stations

Country Status (4)

Country	Link
US (1)	US1371298A (en)
FR (3)	FR519492A (en)
GB (1)	GB144293A (en)
NL (1)	NL8176C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2966556A (en) *	1959-05-18	1960-12-27	Bell Telephone Labor Inc	Dial tone gating circuit

1918
- 1918-09-20 US US254974A patent/US1371298A/en not_active Expired - Lifetime
- 1918-12-31 FR FR519492A patent/FR519492A/en not_active Expired
1919
- 1919-08-09 NL NL12686A patent/NL8176C/xx active
- 1919-10-14 FR FR22613A patent/FR22613E/en not_active Expired
1920
- 1920-01-08 FR FR22688A patent/FR22688E/en not_active Expired
- 1920-06-02 GB GB14995/20A patent/GB144293A/en not_active Expired

Also Published As

Publication number	Publication date
NL8176C (en)	1923-01-15
FR22613E (en)	1921-08-04
FR22688E (en)	1921-08-04
US1371298A (en)	1921-03-15
GB144293A (en)	1920-10-28

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