US2471289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preferential operating valve
Assignee: American Steel Foundries
•
Filing: 1944-06-05
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Granted: 1949-05-24
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Expires: 1964-06-05
Abstract
No abstract record available.
Inventors
- 👤 Robert K Sedgwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:33
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/078; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86638; Y10T137/86831
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE303583C
Cited
US1693758A
Cited
DE558535C
Cited
US1949300A
Cited
US2202216A
Cited
US2293293A
Cited
US2331790A
Cited
US2316944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-23 | 1952-11-22 | 1953-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-23 | 1956-11-22 | 1957-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-23 | 1960-11-22 | 1961-05-24 | $7700.00 | Window Closed / Lapsed |