Patent US3835333A successfully refreshed from Google Patents.
US3835333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Redundant electrical system
Assignee: Individual
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Filing: 1973-03-19
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Granted: 1974-09-10
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Expires: 1993-03-19
Abstract
Abstract A system for providing continuous operation of electrical appliances, lights, etc. comprising a primary load circuit and a secondary load circuit. Each of the load circuits having a source of power and a load. Monitor means is arranged between the primary and secondary load circuits which is responsive to the passage of current in the primary circuit to maintain the secondary circuit inoperative, and responsive to the cessation of current in the primary circuit to render said secondary circuit operative. Preferably the monitor means comprises a transformer and a solenoid relay.
Inventors
- 👤 M Balan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:15
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A redundant electrical system for alternating current comprising a primary load circuit and a secondary load circuit, each of said circuits having a source of power and a load, and transformer and relay monitor means arranged between the primary and secondary load circuits, said monitor means being responsive to the passage of current in the primary circuit to maintain the secondary circuit inoperative, and responsive to the cessation of current in the primary circuit to render said secondary circuit operative, said monitoring means comprising a transformer and a solenoid relay; the primary winding of said transformer being connected in series with the power source and load of said primary circuit and the secondary winding of said transformer being in series with the solenoid of said relay, said relay having contacts in series with the power source and load of the secondary circuit.
Claim 2
Dependent Claim
142 words
A redundant electrical system for alternating current comprising a primary load circuit and a secondary load circuit, each of said circuits having a source of power and a load, and transformer and relay monitor means arranged between the primary and secondary load circuits, said monitor means being responsive to the passage of current in the primary circuit to maintain the secondary circuit inoperative, and responsive to the cessation of current in the primary circuit to render said secondary circuit operative, said monitoring means comprising a transformer and a solenoid relay; the primary winding of said transformer being connected in series with the power source and load of said primary circuit and the secondary winding of said transformer being in series with the solenoid of said relay, said relay having contacts in series with the power source and load of the secondary circuit.
Claim 3
Dependent Claim
16 words
The system according to claim 1 wherein said relay is srping loaded in normally closed position.
Claim 4
Dependent Claim
17 words
The system according to claim 1 wherein said monitoring means includes an indicator of the condition thereof.
Claim 5
Dependent Claim
40 words
The system according to claim 1 including a second contact in said relay and a pilot indicator connected thereto in parallel to the load of said second circuit, said indicator being operable on flow of current in said second circuit.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |