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
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)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7323710A FR2235556B1 ( ) | 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 ( ) | 1973-06-28 | 1973-06-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2235556A1 FR2235556A1 ( ) | 1975-01-24 |
FR2235556B1 true FR2235556B1 ( ) | 1978-09-08 |
Family
ID=9121721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7323710A Expired FR2235556B1 ( ) | 1973-06-28 | 1973-06-28 |
Country Status (4)
Country | Link |
---|---|
US (1) | US3919493A ( ) |
DE (1) | DE2427042C3 ( ) |
FR (1) | FR2235556B1 ( ) |
GB (1) | GB1473878A ( ) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE435777B (sv) * | 1979-01-29 | 1984-10-15 | Ibuki Kogyo Co Ltd | Elektriskt horn |
WO1981000657A1 (en) * | 1979-08-20 | 1981-03-05 | Western Electric Co | Electronic tone ringer |
US5172408A (en) * | 1990-08-01 | 1992-12-15 | At&T Bell Laboratories | Speakerphone state-controlled alerting arrangement |
Family Cites Families (6)
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 ( ) * | 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 |
-
1973
- 1973-06-28 FR FR7323710A patent/FR2235556B1/fr not_active Expired
-
1974
- 1974-06-03 US US476064A patent/US3919493A/en not_active Expired - Lifetime
- 1974-06-05 DE DE2427042A patent/DE2427042C3/de not_active Expired
- 1974-06-28 GB GB2887874A patent/GB1473878A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2427042A1 (de) | 1975-01-30 |
US3919493A (en) | 1975-11-11 |
FR2235556A1 ( ) | 1975-01-24 |
DE2427042B2 (de) | 1977-08-18 |
DE2427042C3 (de) | 1978-04-13 |
GB1473878A (en) | 1977-05-18 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |