Patent US2643679A successfully refreshed from Google Patents.
US2643679A
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Corrosion resistant valve
Assignee: United States Steel Corp
•
Filing: 1949-04-27
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Granted: 1953-06-30
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Expires: 1969-04-27
Abstract
No abstract record available.
Inventors
- 👤 Roy P Keammerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:45
CPC Classifications
F; F16; F16K; F16K27/00; F16K27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1499578A
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US1818856A
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US2454160A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |