Patent NL7512684A successfully refreshed from Google Patents.
US2684831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbine and like rotor
Assignee: Power Jets Research and Development Ltd
•
Filing: 1948-11-22
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Granted: 1954-07-27
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Expires: 1968-11-22
Abstract
No abstract record available.
Inventors
- 👤 Grantham Cyril
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:27
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/02; F01D5/028; F01D5/021; F01D5/08; F01D5/081; F01D5/30; F01D5/3007; F01D5/3015
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |