FR2235556B1 - - Google Patents

Info

Publication number
FR2235556B1
FR2235556B1 FR7323710A FR7323710A FR2235556B1 FR 2235556 B1 FR2235556 B1 FR 2235556B1 FR 7323710 A FR7323710 A FR 7323710A FR 7323710 A FR7323710 A FR 7323710A FR 2235556 B1 FR2235556 B1 FR 2235556B1
Authority
FR
France
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
FR7323710A
Other languages
French (fr)
Other versions
FR2235556A1 (show.php
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.)
PERSON JEAN MICHEL
Original Assignee
PERSON JEAN MICHEL
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.)
Filing date
Publication date
Application filed by PERSON JEAN MICHEL filed Critical PERSON JEAN MICHEL
Priority to FR7323710A priority Critical patent/FR2235556B1/fr
Priority to US476064A priority patent/US3919493A/en
Priority to DE2427042A priority patent/DE2427042C3/de
Priority to GB2887874A priority patent/GB1473878A/en
Publication of FR2235556A1 publication Critical patent/FR2235556A1/fr
Application granted granted Critical
Publication of FR2235556B1 publication Critical patent/FR2235556B1/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Mobile Radio Communication Systems (AREA)
FR7323710A 1973-06-28 1973-06-28 Expired FR2235556B1 (show.php)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR7323710A FR2235556B1 (show.php) 1973-06-28 1973-06-28
US476064A US3919493A (en) 1973-06-28 1974-06-03 Telephone ringing circuit
DE2427042A DE2427042C3 (de) 1973-06-28 1974-06-05 Schaltungsanordnung zum Umwandeln eines elektrischen Wechselstromsignals relativ niedriger Frequenz in ein akustisches Signal davon abweichender Frequenz in Fernmeldeanlagen
GB2887874A GB1473878A (en) 1973-06-28 1974-06-28 Telephone ringing circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7323710A FR2235556B1 (show.php) 1973-06-28 1973-06-28

Publications (2)

Publication Number Publication Date
FR2235556A1 FR2235556A1 (show.php) 1975-01-24
FR2235556B1 true FR2235556B1 (show.php) 1978-09-08

Family

ID=9121721

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7323710A Expired FR2235556B1 (show.php) 1973-06-28 1973-06-28

Country Status (4)

Country Link
US (1) US3919493A (show.php)
DE (1) DE2427042C3 (show.php)
FR (1) FR2235556B1 (show.php)
GB (1) GB1473878A (show.php)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE435777B (sv) * 1979-01-29 1984-10-15 Ibuki Kogyo Co Ltd Elektriskt horn
JPS56501185A (show.php) * 1979-08-20 1981-08-20
US5172408A (en) * 1990-08-01 1992-12-15 At&T Bell Laboratories Speakerphone state-controlled alerting arrangement

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3471651A (en) * 1967-01-13 1969-10-07 Ibm Telephone ringing circuit
US3539732A (en) * 1967-03-18 1970-11-10 Carlos Weissenberg Electronic system for signaling the entrance of telephone calls in multiline telephone sets
FR1581035A (show.php) * 1968-07-08 1969-09-12
US3536852A (en) * 1969-01-23 1970-10-27 Lorain Prod Corp Telephone interruption switching circuitry
US3603740A (en) * 1969-08-18 1971-09-07 Northern Electric Co Method and means for ringing a telephone subset
US3688038A (en) * 1971-04-12 1972-08-29 Stromberg Carlson Corp Stored energy signalling circuit

Also Published As

Publication number Publication date
DE2427042A1 (de) 1975-01-30
DE2427042B2 (de) 1977-08-18
DE2427042C3 (de) 1978-04-13
GB1473878A (en) 1977-05-18
US3919493A (en) 1975-11-11
FR2235556A1 (show.php) 1975-01-24

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Legal Events

Date Code Title Description
ST Notification of lapse