US3364469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal ratio alarm system
Assignee: AT&T Inc
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Filing: 1963-12-18
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Granted: 1968-01-16
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Expires: 1983-12-18
Abstract
No abstract record available.
Inventors
- 👤 Norwood G Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:00
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/22; H03K5/26; G; G07; G07C; G07C3/00; G07C3/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
115 words
A CRITICAL RATIO DETECTOR COMPRISING, IN COMBINATION, A FIRST PULSE GENERATOR HAVING A PREDETERMINED PULSE REPETITION RATE, A SECOND PULSE GENERATOR HAVING A PREDETERMINED PULSE REPETITION RATE, A FIRST AND A SECOND SIGNAL, THE CRITICAL RATIO OF THE RESPECTIVE DURATIONS OF SAID FIRST AND SECOND SIGNALS BEING MONITORED FOR A PREDETERMINED MEASURING PERIOD, THE RATIO OF THE PULSE REPETITION RATES OF SAID FIRST AND SAID SECOND PULSE GENERATORS BEING INVERSELY PROPORTIONAL TO SAID CRITICAL RATIO, PULSE COUNTING MEANS, ENABLING MEANS TO CONNECT THE OUTPUT OF SAID FIRST PULSE GENERATOR TO SAID PULSE COUNTING MEANS, SAID ENABLING MEANS BEING RESPONSIVE TO SAID FIRST SIGNAL, DISABLING MEANS TO DISCONNECT THE OUTPUT OF SAID SECOND PULSE GENERATOR FROM
References Cited (Backward Citations)
US2951986A
Cited
US3253254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-15 | 1971-07-17 | 1972-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-15 | 1975-07-17 | 1976-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-15 | 1979-07-17 | 1980-01-16 | $7700.00 | Window Closed / Lapsed |