US3322903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone signaling system
Assignee: AT&T Inc
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Filing: 1964-03-12
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Granted: 1967-05-30
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Expires: 1984-03-12
Abstract
No abstract record available.
Inventors
- 👤 Daryl M Chapin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:34
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/82; H04M19/00; H04M19/02; H04M19/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A CODED RINGING SIGNAL DETECTOR COMPRISING DETECTION MEANS FOR DETECTING SAID RINGING SIGNALS, MEANS RESPONSIVE TO SAID DETECTOR FOR PROVIDING A TIME-OUT INDICATION A FIXED LENGTH OF TIME AFTER SAID RINGING SIGNALS HAVE TERMINATED, COUNTING MEANS FOR COUNTING THE NUMBER OF RINGING SIGNAL BURSTS RECEIVED, AND INDICATING MEANS RESPONSIVE TO SAID COUNTING MEANS FOR INDICATING THE RECEPTION OF A PRESELECTED NUMBER OF RINGING SIGNAL BURSTS WHEN SAID TIME-OUT INDICATION IS PROVIDED.
Claim 2
Dependent Claim
71 words
A CODED RINGING SIGNAL DETECTOR COMPRISING DETECTION MEANS FOR DETECTING SAID RINGING SIGNALS, MEANS RESPONSIVE TO SAID DETECTOR FOR PROVIDING A TIME-OUT INDICATION A FIXED LENGTH OF TIME AFTER SAID RINGING SIGNALS HAVE TERMINATED, COUNTING MEANS FOR COUNTING THE NUMBER OF RINGING SIGNAL BURSTS RECEIVED, AND INDICATING MEANS RESPONSIVE TO SAID COUNTING MEANS FOR INDICATING THE RECEPTION OF A PRESELECTED NUMBER OF RINGING SIGNAL BURSTS WHEN SAID TIME-OUT INDICATION IS PROVIDED.
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) | 1970-05-29 | 1970-11-28 | 1971-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-29 | 1974-11-28 | 1975-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-29 | 1978-11-28 | 1979-05-30 | $7700.00 | Window Closed / Lapsed |