Patent US3149320A successfully refreshed from Google Patents.
US3149320A
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Signalling apparatus
Assignee: Potter Electric Signal Co LLC
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Filing: 1962-08-13
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Granted: 1964-09-15
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Expires: 1982-08-13
Abstract
No abstract record available.
Inventors
- 👤 Patrick J Devine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:37
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/16; G08B13/1654; G08B13/1672; G08B23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
FOR USE WITH A CENTRAL SIGNAL STATION AT WHICH IS OBSERVED THE FLOW OF DIRECT CURRENT TRANSMITTED FROM A DIRECT CURRENT SOURCE AT SAID CENTRAL STATION THROUGH A SIGNALLING WIRE TO AN IMPROVED REMOTE STATION SOUND ALARM HAVING AN INPUT TERMINAL FOR CONNECTION TO THE SIGNALLING WIRE, A BASIC CURRENT RESISTOR IN A FIRST PARALLEL CIRCUIT CONNECTED TO SAID INPUT TERMINAL, BY WHOSE RESISTANCE A KNOWN BASIC FLOW RATE OVER THE SIGNALLING WIRE IS IDENTIFIABLE WITH A NORMALLY PERSISTING CONDITION AT THE REMOTE STATION, SILICON-CONTROLLED SWITCH MEANS IN A SECOND PARALLEL CIRCUIT CONNECTED TO SAID INPUT TERMINAL TO ALTER THE BASIC FLOW RATE, A MICROPHONE, A TRANSISTORIZED AMPLIFIER CONNECTED TO SAID MICROPHONE, THE OUTPUT OF THE AMPLIFIER BEING OPERATIVELY CONNECTED TO THE SILICON-CONTROLLED SWITCH MEANS, A RECHARGEABLE REMOTE STATION BATTERY CONNECTED TO SAID TRANSISTORIZED AMPLIFIER FOR SUPPLYING POWER THERETO, AND A BATTERY RECHARGE CURRENT LIMITING RESISTOR IN A THIRD PARALLEL CIRCUIT INCLUDING SAID REMOTE STATION BATTERY, WHEREBY SUCH BASIC FLOW RATE OVER THE SIGNALLING WIRE INCLUDES THE FLOW RATE OF CHARGING CURRENT FOR THE REMOTE STATION BATTERY.
Claim 2
Dependent Claim
177 words
FOR USE WITH A CENTRAL SIGNAL STATION AT WHICH IS OBSERVED THE FLOW OF DIRECT CURRENT TRANSMITTED FROM A DIRECT CURRENT SOURCE AT SAID CENTRAL STATION THROUGH A SIGNALLING WIRE TO AN IMPROVED REMOTE STATION SOUND ALARM HAVING AN INPUT TERMINAL FOR CONNECTION TO THE SIGNALLING WIRE, A BASIC CURRENT RESISTOR IN A FIRST PARALLEL CIRCUIT CONNECTED TO SAID INPUT TERMINAL, BY WHOSE RESISTANCE A KNOWN BASIC FLOW RATE OVER THE SIGNALLING WIRE IS IDENTIFIABLE WITH A NORMALLY PERSISTING CONDITION AT THE REMOTE STATION, SILICON-CONTROLLED SWITCH MEANS IN A SECOND PARALLEL CIRCUIT CONNECTED TO SAID INPUT TERMINAL TO ALTER THE BASIC FLOW RATE, A MICROPHONE, A TRANSISTORIZED AMPLIFIER CONNECTED TO SAID MICROPHONE, THE OUTPUT OF THE AMPLIFIER BEING OPERATIVELY CONNECTED TO THE SILICON-CONTROLLED SWITCH MEANS, A RECHARGEABLE REMOTE STATION BATTERY CONNECTED TO SAID TRANSISTORIZED AMPLIFIER FOR SUPPLYING POWER THERETO, AND A BATTERY RECHARGE CURRENT LIMITING RESISTOR IN A THIRD PARALLEL CIRCUIT INCLUDING SAID REMOTE STATION BATTERY, WHEREBY SUCH BASIC FLOW RATE OVER THE SIGNALLING WIRE INCLUDES THE FLOW RATE OF CHARGING CURRENT FOR THE REMOTE STATION BATTERY.
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) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |