US3113293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flashing light systems
Assignee: Chicago Rock Island and Pacific Railroad Co
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Filing: 1961-11-08
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Granted: 1963-12-03
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Expires: 1981-11-08
Abstract
No abstract record available.
Inventors
- 👤 Breese Robert Finley
- 👤 Albert C Zagotta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:18
CPC Classifications
B; B61; B61L; B61L15/00; B61L15/02; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/46; B61L5/00; B61L5/12; B61L5/18; B61L5/189; H; H05; H05B; H05B39/00; H05B39/09; Y; Y10; Y10S; Y10S362/00; Y10S362/812
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
IN A RAILROAD FLASHING LIGHT SYSTEM, NEGATIVE AND POSITIVE TERMINALS FOR CONNECTION TO A VOLTAGE SOURCE, FIRST AND SECOND SILICON CONTROLLED RECTIFIERS EACH HAVING GATE AND ANODE ELECTRODES, AND A CATHODE CONNECTED TO SAID NEGATIVE TERMINAL, FIRST AND SECOND LAMPS RESPECTIVELY CONNECTED BETWEEN SAID ANODE ELECTRODES AND SAID POSITIVE TERMINAL, A COMMUTATING CAPACITOR CONNECTED BETWEEN SAID ANODE ELECTRODES, MEANS NORMALLY OPERATIVE TO MAINTAIN EACH OF SAID GATE ELECTRODES AT A CERTAIN POTENTIAL RELATIVE TO SAID CATHODE, MEANS FOR PERIODICALLY APPLYING A PAIR OF SYNCHRONIZED PULSES TO SAID GATE ELECTRODES TO INITIATE CONDUCTION OF ONE RECTIFIER AND THEREBY CUT OFF CONDUCTION THROUGH THE OTHER, AND A PAIR OF RESISTORS CONNECTED IN PARALLEL WITH SAID RECTIFIERS TO REDUCE THE VOLTAGE ACROSS EACH RECTIFIER WHILE IT IS NON-CONDUCTIVE AND TO ALSO MAINTAIN THE ASSOCIATED LAMP IN A DIMMED CONDITION.
Claim 2
Dependent Claim
136 words
IN A RAILROAD FLASHING LIGHT SYSTEM, NEGATIVE AND POSITIVE TERMINALS FOR CONNECTION TO A VOLTAGE SOURCE, FIRST AND SECOND SILICON CONTROLLED RECTIFIERS EACH HAVING GATE AND ANODE ELECTRODES, AND A CATHODE CONNECTED TO SAID NEGATIVE TERMINAL, FIRST AND SECOND LAMPS RESPECTIVELY CONNECTED BETWEEN SAID ANODE ELECTRODES AND SAID POSITIVE TERMINAL, A COMMUTATING CAPACITOR CONNECTED BETWEEN SAID ANODE ELECTRODES, MEANS NORMALLY OPERATIVE TO MAINTAIN EACH OF SAID GATE ELECTRODES AT A CERTAIN POTENTIAL RELATIVE TO SAID CATHODE, MEANS FOR PERIODICALLY APPLYING A PAIR OF SYNCHRONIZED PULSES TO SAID GATE ELECTRODES TO INITIATE CONDUCTION OF ONE RECTIFIER AND THEREBY CUT OFF CONDUCTION THROUGH THE OTHER, AND A PAIR OF RESISTORS CONNECTED IN PARALLEL WITH SAID RECTIFIERS TO REDUCE THE VOLTAGE ACROSS EACH RECTIFIER WHILE IT IS NON-CONDUCTIVE AND TO ALSO MAINTAIN THE ASSOCIATED LAMP IN A DIMMED CONDITION.
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) | 1966-12-02 | 1967-06-03 | 1967-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-02 | 1971-06-03 | 1971-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-02 | 1975-06-03 | 1975-12-03 | $7700.00 | Window Closed / Lapsed |