Patent US2979809A successfully refreshed from Google Patents.
US2979809A
Expired / Lapsed
US
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Method of making hollow turbine blades
Assignee: Napier Turbochargers Ltd
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Filing: 1957-03-11
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Granted: 1961-04-18
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Expires: 1977-03-11
Abstract
No abstract record available.
Inventors
- 👤 Dennis Leonard James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:06
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/78; F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/147; F01D5/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339; Y10T29/49341
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1980834A
Cited
GB359349A
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US2378059A
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US2559013A
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US2559131A
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US2675208A
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US2772855A
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US2762114A
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US2799919A
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US2699598A
Cited
DE926397C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |