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Patent US3372303A successfully refreshed from Google Patents.
US3372303A
Expired / Lapsed
US
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A. c. switch contacts
Assignee: F Devetta Electronics Ltd
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Filing: 1966-02-17
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Granted: 1968-03-05
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Expires: 1986-02-17
Abstract
No abstract record available.
Inventors
- 👤 Knott Leonard George Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:55
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/44; H01H9/00; H01H9/54; H01H9/541; H01H9/542; H01H2009/543
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A DEVICE FOR CONNECTION ACROSS A PAIR OF A.C. SWITCH CONTACTS COMPRISING AT LEAST ONE SILICON CONTROLLED RECTIFIER CONNECTABLE IN PARALLEL WITH THE CONTACTS FOR CARRYING CURRENT IN EITHER DIRECTION, SPLIT TRANSFORMER MEANS PART IN SERIES WITH THE CONTACTS AND PART IN SERIES WITH THE S.C.R. AND MEANS FOR DERIVING A CONTROL SIGNAL FOR THE S.C.R. FROM THE TRANSFORMER MEANS WHEREBY THE CURRENT WHICH WOULD OTHERWISE PRODUCE ARCING OR SPARKING IS PASSED THROUGH THE S.C.R. AND THE S.C.R. IS DE-TRIGGERED THEREBY SO THAT IT SWITCHES OFF WHEN THE VOLTAGE ACROSS IT HAS ZERO VALUE.
Claim 2
Independent Claim
94 words
A DEVICE FOR CONNECTION ACROSS A PAIR OF A.C. SWITCH CONTACTS COMPRISING AT LEAST ONE SILICON CONTROLLED RECTIFIER CONNECTABLE IN PARALLEL WITH THE CONTACTS FOR CARRYING CURRENT IN EITHER DIRECTION, SPLIT TRANSFORMER MEANS PART IN SERIES WITH THE CONTACTS AND PART IN SERIES WITH THE S.C.R. AND MEANS FOR DERIVING A CONTROL SIGNAL FOR THE S.C.R. FROM THE TRANSFORMER MEANS WHEREBY THE CURRENT WHICH WOULD OTHERWISE PRODUCE ARCING OR SPARKING IS PASSED THROUGH THE S.C.R. AND THE S.C.R. IS DE-TRIGGERED THEREBY SO THAT IT SWITCHES OFF WHEN THE VOLTAGE ACROSS IT HAS ZERO VALUE.
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) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |