US3703607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone dialing and information transmission circuit
Assignee: ACREN CORP
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Filing: 1970-08-18
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Granted: 1972-11-21
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Expires: 1990-08-18
Abstract
Abstract The specification discloses a circuit for automatically dialing pre-recorded telephone numbers and transmitting a pre-recorded message to the number dialed. The circuit is triggered by a contact closure indicating an emergency condition. The triggering energizes the recording media drive motor and selects the appropriate information track on the recording media for connection to the telephone lines. Dialing is accomplished by a relay driving arrangement which amplifies pre-recorded dial pulse information and attenuates the message information.
Inventors
- 👤 Herbert I Coben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:25
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/04; H04M11/045
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
29 words
Transformer T1 provides DC isolation between the telephone lines and the output of amplifier 5 as well as impedance matching the amplifier output to the telephone lines. oI claim:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |