Patent US3175192A successfully refreshed from Google Patents.
US3175192A
Expired / Lapsed
US
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Selective decoder utilizing plural frequency reeds
Assignee: Individual
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Filing: 1962-07-20
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Granted: 1965-03-23
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Expires: 1982-07-20
Abstract
No abstract record available.
Inventors
- 👤 James P Keltner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:11
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04W88/022; H04W88/025; H04W88/027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN A DECODING SYSTEM, A MULTIPLE-RESONANT RELAY HAVING A PLURALITY OF FREQUENCY-RESPONSIVE CIRCUIT CLOSERS, EACH CLOSING IN RESPONSE TO THE RECEPTION OF A PREDETERMINED SIGNAL FREQUENCY BY SAID RELAY, A SOURCE OF OPERATING VOLTAGE, A CAPACITOR, MEANS TO DISCHARGE SAID CAPACITOR FROM SAID SOURCE, MEANS TO MAINTAIN SAID CAPACITOR CONTINUOUSLY CHARGED IN THE ABSENCE OF A SIGNAL, A PLURALITY OF TWOELEMENT BISTABLE FLIP-FLOP CIRCUITS, EACH BEING RESPONSIVE TO A SEPARATE TONE OF A CODING SIGNAL AND EACH HAVING A NORMAL UNBALANCE SUCH THAT ONE ELEMENT THEREOF IS IN A NORMALLY CONDUCTIVE CONDITION AND THE OTHER ELEMENT IS NORMALLY NON-CONDUCTIVE, A DISCHARGE CIRCUIT CONNECTED TO SAID CAPACITOR AND INCLUDING ONE OF SAID FREQUENCYRESPONSIVE CIRCUIT CLOSERS, WHEREBY SAID CAPACITOR DIS-
Claim 2
Dependent Claim
118 words
IN A DECODING SYSTEM, A MULTIPLE-RESONANT RELAY HAVING A PLURALITY OF FREQUENCY-RESPONSIVE CIRCUIT CLOSERS, EACH CLOSING IN RESPONSE TO THE RECEPTION OF A PREDETERMINED SIGNAL FREQUENCY BY SAID RELAY, A SOURCE OF OPERATING VOLTAGE, A CAPACITOR, MEANS TO DISCHARGE SAID CAPACITOR FROM SAID SOURCE, MEANS TO MAINTAIN SAID CAPACITOR CONTINUOUSLY CHARGED IN THE ABSENCE OF A SIGNAL, A PLURALITY OF TWOELEMENT BISTABLE FLIP-FLOP CIRCUITS, EACH BEING RESPONSIVE TO A SEPARATE TONE OF A CODING SIGNAL AND EACH HAVING A NORMAL UNBALANCE SUCH THAT ONE ELEMENT THEREOF IS IN A NORMALLY CONDUCTIVE CONDITION AND THE OTHER ELEMENT IS NORMALLY NON-CONDUCTIVE, A DISCHARGE CIRCUIT CONNECTED TO SAID CAPACITOR AND INCLUDING ONE OF SAID FREQUENCYRESPONSIVE CIRCUIT CLOSERS, WHEREBY SAID CAPACITOR DIS-
References Cited (Backward Citations)
US2600405A
Cited
US2912574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |