US2658455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impeller with center intake
Assignee: De Laval Steam Turbine Co
•
Filing: 1948-02-26
•
Granted: 1953-11-10
•
Expires: 1968-02-26
Abstract
No abstract record available.
Inventors
- 👤 Ludwik R Seinfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:17
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2261; F04D29/2266; F04D29/2205; F04D29/2211
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US445919A
Cited
US564897A
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GB191128980A
Cited
US1175162A
Cited
US1503776A
Cited
US1877347A
Cited
US1904054A
Cited
US2425171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |