Patent US2940726A successfully refreshed from Google Patents.
US2940726A
Expired / Lapsed
US
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Hollow blades for turbines and the like
Assignee: Napier Turbochargers Ltd
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Filing: 1956-10-11
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Granted: 1960-06-14
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Expires: 1976-10-11
Abstract
No abstract record available.
Inventors
- 👤 Leonard J Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:57
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/3076; B; B66; B66D; B66D1/00; B66D1/02; B66D1/14; B66D1/20; F01D5/12; F01D5/14; F01D5/18; B66D2700/00; B66D2700/01; B66D2700/0125; B66D2700/015; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1314806A
Cited
DE853534C
Cited
US2656146A
Cited
US2749028A
Cited
FR1100857A
Cited
US2819870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |