Patent US2725221A successfully refreshed from Google Patents.
US2725221A
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US
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Steam conversion valve
Assignee: Siemens Schuckertwerke AG
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Filing: 1952-12-03
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Granted: 1955-11-29
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Expires: 1972-12-03
Abstract
No abstract record available.
Inventors
- 👤 Pontow Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:41
CPC Classifications
F; F16; F16K; F16K49/00; F22; F22G; F22G5/00; F22G5/12; F22G5/123; F22G5/126; Y; Y10; Y10S; Y10S261/00; Y10S261/13; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87571; Y10T137/87652; Y10T137/8766
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1257494A
Cited
US1576109A
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US1932764A
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US2084340A
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US2138064A
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US2300642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |