Patent US2921564A successfully refreshed from Google Patents.
US2921564A
Expired / Lapsed
US
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Automatic blowdown for steam generator
Assignee: Clayton Manufacturing Co
•
Filing: 1955-11-10
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Granted: 1960-01-19
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Expires: 1975-11-10
Abstract
No abstract record available.
Inventors
- 👤 George W Mattox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:17
CPC Classifications
F; F22; F22B; F22B27/00; F22B27/04; F22B27/08; F22B37/00; F22B37/02; F22B37/56; F22B37/565
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US2573680A
Cited
US2800117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |