US2552830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace wall construction
Assignee: Combustion Engineering Inc
•
Filing: 1948-08-06
•
Granted: 1951-05-15
•
Expires: 1968-08-06
Abstract
No abstract record available.
Inventors
- 👤 Ernest C Witzke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:01
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/10; F22B37/20; F22B37/204; F22B37/101; F22B37/102; F22B37/208; Y; Y10; Y10S; Y10S122/00; Y10S122/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1717751A
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US1890170A
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US2061404A
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US1880187A
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GB294202A
Cited
US1904189A
Cited
US1900443A
Cited
US1856036A
Cited
US1858489A
Cited
US1970585A
Cited
US2305611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |