US3143729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot signal circuit
Assignee: Tung Sol Electric Inc
•
Filing: 1961-04-13
•
Granted: 1964-08-04
•
Expires: 1981-04-13
Abstract
No abstract record available.
Inventors
- 👤 Roy B Power
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:36
CPC Classifications
B; B60; B60Q; B60Q11/00; B60Q11/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A PILOT SIGNAL FOR SHOWING THE EXISTENCE OF UNBALANCED OPERATING CURRENTS THROUGH A LOAD CIRCUIT COMPRISING, A PAIR OF NORMALLY BALANCED LAMP LOAD CIRCUITS OPERATED BY A SOURCE OF DIRECT CURRENT ELECTRIC POWER, MODULATING MEANS FOR CHANGING THE CURRENT VALUES APPLIED TO THE LOADS, A FERROMAGNETIC CORE CARRYING TWO OPPOSED PRIMARY WINDINGS, EACH CONNECTED IN SERIES WITH ONE OF SAID LOAD CIRCUITS AND EACH CONNECTED TO THE SOURCE OF ELECTRIC POWER, A SECONDARY WINDING ALSO ON SAID CORE FOR PROVIDING A VOLTAGE PULSE WHENEVER THE CURRENTS THROUGH THE LOADS DIFFER BY A SUBSTANTIAL AMOUNT, AND A WARNING CIRCUIT CONNECTED TO THE SOURCE OF POWER AND INCLUDING A SIGNAL LAMP AND A CONTROLLABLE IMPEDANCE, SAID IMPEDANCE COUPLED TO THE SECONDARY WINDING AND NORMALLY NON-CONDUCTIVE BUT ADAPTED TO LIGHT THE SIGNAL LAMP WHEN ACTUATED BY A PULSE AND TO MAINTAIN THE SIGNAL LAMP LIGHTED.
Claim 2
Dependent Claim
142 words
A PILOT SIGNAL FOR SHOWING THE EXISTENCE OF UNBALANCED OPERATING CURRENTS THROUGH A LOAD CIRCUIT COMPRISING, A PAIR OF NORMALLY BALANCED LAMP LOAD CIRCUITS OPERATED BY A SOURCE OF DIRECT CURRENT ELECTRIC POWER, MODULATING MEANS FOR CHANGING THE CURRENT VALUES APPLIED TO THE LOADS, A FERROMAGNETIC CORE CARRYING TWO OPPOSED PRIMARY WINDINGS, EACH CONNECTED IN SERIES WITH ONE OF SAID LOAD CIRCUITS AND EACH CONNECTED TO THE SOURCE OF ELECTRIC POWER, A SECONDARY WINDING ALSO ON SAID CORE FOR PROVIDING A VOLTAGE PULSE WHENEVER THE CURRENTS THROUGH THE LOADS DIFFER BY A SUBSTANTIAL AMOUNT, AND A WARNING CIRCUIT CONNECTED TO THE SOURCE OF POWER AND INCLUDING A SIGNAL LAMP AND A CONTROLLABLE IMPEDANCE, SAID IMPEDANCE COUPLED TO THE SECONDARY WINDING AND NORMALLY NON-CONDUCTIVE BUT ADAPTED TO LIGHT THE SIGNAL LAMP WHEN ACTUATED BY A PULSE AND TO MAINTAIN THE SIGNAL LAMP LIGHTED.
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) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |