Patent US2853272A successfully refreshed from Google Patents.
US2853272A
Expired / Lapsed
US
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Hollow blades for turbo machines
Assignee: Napier Turbochargers Ltd
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Filing: 1953-09-08
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Granted: 1958-09-23
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Expires: 1973-09-08
Abstract
No abstract record available.
Inventors
- 👤 Odds William James Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:07
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/187
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1516607A
Cited
FR878999A
Cited
US2563269A
Cited
US2618120A
Cited
US2656146A
Cited
FR991982A
Cited
US2647368A
Cited
US2650803A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |