Patent US2607325A successfully refreshed from Google Patents.
US2607325A
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US
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Vertical water-tube boiler with removable combustion chamber
Assignee: CALEFACTOR Corp
•
Filing: 1948-12-15
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Granted: 1952-08-19
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Expires: 1968-12-15
Abstract
No abstract record available.
Inventors
- 👤 Charles T Denker
- 👤 John R Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:40
CPC Classifications
F; F22; F22B; F22B13/00; F22B13/02; F22B13/023; Y; Y10; Y10S; Y10S122/00; Y10S122/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US358423A
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US555754A
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US622352A
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US2385065A
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US662882A
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US1796713A
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US2096586A
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US2228757A
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US2277974A
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US2429916A
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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) | 1955-08-19 | 1956-02-18 | 1956-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-19 | 1960-02-18 | 1960-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-19 | 1964-02-18 | 1964-08-19 | $7700.00 | Window Closed / Lapsed |