Patent US3491284A successfully refreshed from Google Patents.
US3491284A
Expired / Lapsed
US
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Zero voltage a.c. switching circuits
Assignee: Grigsby Barton Inc
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Filing: 1967-05-24
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Granted: 1970-01-20
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Expires: 1987-05-24
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Pascente
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:26
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/083; H03; H03K; H03K17/00; H03K17/13; H03K17/136
Claims Analysis
Total Claims: 0
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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) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |