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Patent US3089078A successfully refreshed from Google Patents.
US3089078A
Expired / Lapsed
US
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Direct current to three-phase rotating converter
Assignee: Rolls Royce PLC
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Filing: 1959-02-25
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Granted: 1963-05-07
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Expires: 1979-02-25
Abstract
No abstract record available.
Inventors
- 👤 Smith Alfred John
- 👤 Mellin Kenneth Roland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:05
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190701686A
Cited
GB190703927A
Cited
US899629A
Cited
US1245356A
Cited
US1691986A
Cited
US1703242A
Cited
US1842340A
Cited
US2929014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-06 | 1966-11-05 | 1967-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-06 | 1970-11-05 | 1971-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-06 | 1974-11-05 | 1975-05-07 | $7700.00 | Window Closed / Lapsed |