US3422275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water turbines, pumps and reversible pump turbines
Assignee: English Electric Co Ltd
•
Filing: 1965-10-19
•
Granted: 1969-01-14
•
Expires: 1985-10-19
Abstract
No abstract record available.
Inventors
- 👤 Michael Braikevitch
- 👤 Bruce Donald Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:10
CPC Classifications
F; F03; F03B; F03B13/00; F03B13/08; F03B13/083; H; H02; H02K; H02K7/00; H02K7/18; H02K7/1807; H02K7/1823; Y; Y02; Y02E; Y02E10/00; Y02E10/20; Y10; Y10S; Y10S415/00; Y10S415/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2436683A
Cited
US2782321A
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US2814254A
Cited
US2809310A
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US3138105A
Cited
US3231768A
Cited
US3256829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |