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US2544731A
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Prefill valve
Assignee: American Steel Foundries
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Filing: 1948-03-18
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Granted: 1951-03-13
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Expires: 1968-03-18
Abstract
No abstract record available.
Inventors
- 👤 Robert K Sedgwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:52
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/16; B30B15/18; B30B15/183
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1892568A
Cited
US1940668A
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US2077894A
Cited
US2161804A
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US2204270A
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US2343177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |