US3040226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase transformer arrangements and induction machines employing phase transformer arrangements
Assignee: National Research Development Corp UK
•
Filing: 1959-10-05
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Granted: 1962-06-19
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Expires: 1979-10-05
Abstract
No abstract record available.
Inventors
- 👤 Williams Frederic Calland
- 👤 Laithwaite Eric Roberts
- 👤 Eastham John Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:50
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/30
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) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |