Patent US2520697A successfully refreshed from Google Patents.
US2520697A
Expired / Lapsed
US
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Internal-combustion turbine plant
Assignee: Metropolitan Vickers Electrical Co Ltd
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Filing: 1945-02-27
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Granted: 1950-08-29
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Expires: 1965-02-27
Abstract
No abstract record available.
Inventors
- 👤 Smith David Macleish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:50
CPC Classifications
F; F04; F04D; F04D27/00; F04D27/02; F04D27/0207; F04D27/0215; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1111498A
Cited
US1263056A
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US1796053A
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US2099699A
Cited
GB504214A
Cited
US2321276A
Cited
US2314058A
Cited
US2418801A
Cited
US2344835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |