US2773487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace having walls organized for cubical expansion
Assignee: Combustion Engineering Inc
•
Filing: 1952-08-27
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Granted: 1956-12-11
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Expires: 1972-08-27
Abstract
No abstract record available.
Inventors
- 👤 Paul R Walter
- 👤 Ernest C Witzke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:58
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/10; F22B37/20; F22B37/201; F22B37/208; F22B37/36; F22B37/365
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2536039A
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US2583599A
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US2655238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |