US2924934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for varying the effective crosssectional area of one part of a fluid flow duct
Assignee: Armstrong Siddeley Motors Ltd
•
Filing: 1954-09-03
•
Granted: 1960-02-16
•
Expires: 1974-09-03
Abstract
No abstract record available.
Inventors
- 👤 Horace S Rainbow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:06
CPC Classifications
F; F16; F16K; F16K13/00; F16K13/02; F02; F02C; F02C7/00; F02C7/04; F02C7/042; F02K; F02K1/00; F02K1/06; F02K1/12; F02K1/78; F02K1/80; F02K1/805; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2620622A
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US2551372A
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US2488174A
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FR943820A
Cited
FR56672E
Cited
US2570847A
Cited
US2693078A
Cited
US2649272A
Cited
US2791882A
Cited
US2625008A
Cited
US2682147A
Cited
US2770944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-15 | 1963-08-17 | 1964-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-15 | 1967-08-17 | 1968-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-15 | 1971-08-17 | 1972-02-16 | $7700.00 | Window Closed / Lapsed |