Patent US3824148A successfully refreshed from Google Patents.
Patent US3132255A successfully refreshed from Google Patents.
US3132255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isolating device for transfer switch installations
Assignee: Automatic Switch Co
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Filing: 1959-05-01
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Granted: 1964-05-05
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Expires: 1979-05-01
Abstract
No abstract record available.
Inventors
- 👤 Frank P Spinelli
- 👤 Stotz Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:28
CPC Classifications
H; H01; H01H; H01H31/00; H01H31/26; H01H31/32; H01H2300/00; H01H2300/018
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
IN A POWER PLANT WHICH INCLUDES AN ELECTRIC CIRCUIT LEADING TO A NORMAL SOURCE OF POWER, AN ELECTRIC CIRCUIT LEADING TO AN ALTERNATE SOURCE OF POWER, AND AN ELECTRIC CIRCUIT LEADING TO A LOAD: A TRANSFER SWITCH UNIT COMPRISING A NORMALLY CLOSED SWITCH BETWEEN SAID LOAD CIRCUIT AND SAID NORMAL-SOURCE CIRCUIT, A NORMALLY OPEN SWITCH BETWEEN SAID LOAD CIRCUIT AND SAID ALTERNATE-SOURCE CIRCUIT, AND MEANS FOR ACTUATING SAID SWITCHES IN UNISON SO THAT ONE IS ALWAYS CLOSED WHILE THE OTHER IS OPEN; AND AN ISOLATING DEVICE COMPRISING AN NORMALLY CLOSED SWITCH IN THE NORMAL-SOURCE CIRCUIT, A NORMALLY CLOSED SWITCH IN THE LOAD CIRCUIT, SAID NORMALLY CLOSED SWITCHES BEING MOVABLE INDEPENDENTLY OF EACH OTHER, A NORMALLY OPEN BYPASS SWITCH BETWEEN SAID NORMAL-SOURCE CIRCUIT AND SAID LOAD CIRCUIT, AND MEANS FOR ACTUATING THE SWITCHES OF SAID ISOLATING DEVICE IN UNISON SO THAT ELECTRICAL CONNECTION BETWEEN THE LOAD AND THE NORMAL POWER SOURCE MAY BE MAINTAINED WHILE THE TRANSFER SWITCH UNIT IS ISOLATED FROM BOTH.
Claim 2
Dependent Claim
162 words
IN A POWER PLANT WHICH INCLUDES AN ELECTRIC CIRCUIT LEADING TO A NORMAL SOURCE OF POWER, AN ELECTRIC CIRCUIT LEADING TO AN ALTERNATE SOURCE OF POWER, AND AN ELECTRIC CIRCUIT LEADING TO A LOAD: A TRANSFER SWITCH UNIT COMPRISING A NORMALLY CLOSED SWITCH BETWEEN SAID LOAD CIRCUIT AND SAID NORMAL-SOURCE CIRCUIT, A NORMALLY OPEN SWITCH BETWEEN SAID LOAD CIRCUIT AND SAID ALTERNATE-SOURCE CIRCUIT, AND MEANS FOR ACTUATING SAID SWITCHES IN UNISON SO THAT ONE IS ALWAYS CLOSED WHILE THE OTHER IS OPEN; AND AN ISOLATING DEVICE COMPRISING AN NORMALLY CLOSED SWITCH IN THE NORMAL-SOURCE CIRCUIT, A NORMALLY CLOSED SWITCH IN THE LOAD CIRCUIT, SAID NORMALLY CLOSED SWITCHES BEING MOVABLE INDEPENDENTLY OF EACH OTHER, A NORMALLY OPEN BYPASS SWITCH BETWEEN SAID NORMAL-SOURCE CIRCUIT AND SAID LOAD CIRCUIT, AND MEANS FOR ACTUATING THE SWITCHES OF SAID ISOLATING DEVICE IN UNISON SO THAT ELECTRICAL CONNECTION BETWEEN THE LOAD AND THE NORMAL POWER SOURCE MAY BE MAINTAINED WHILE THE TRANSFER SWITCH UNIT IS ISOLATED FROM BOTH.
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |