US3462671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thyristor firing circuit
Assignee: Rowan Industries Inc
•
Filing: 1967-12-08
•
Granted: 1969-08-19
•
Expires: 1987-12-08
Abstract
No abstract record available.
Inventors
- 👤 Francis Lawn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:26
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/081; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/1555; H02M7/1557; H02M7/162; H02M7/1623; H02M7/1626
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3176212A
Cited
US3218540A
Cited
US3243689A
Cited
US3213351A
Cited
US3273043A
Cited
US3375428A
Cited
US3348122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-18 | 1973-02-17 | 1973-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-18 | 1977-02-17 | 1977-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-18 | 1981-02-17 | 1981-08-19 | $7700.00 | Window Closed / Lapsed |