US2697422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler furnace
Assignee: Combustion Engineering Inc
•
Filing: 1950-03-16
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Granted: 1954-12-21
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Expires: 1970-03-16
Abstract
No abstract record available.
Inventors
- 👤 Wilbur H Armacost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:23
CPC Classifications
F; F23; F23C; F23C99/00; F22; F22B; F22B37/00; F22B37/02; F22B37/10; F22B37/14; F22B37/141; F22B37/147; F22G; F22G5/00; F22G5/02; F23C2700/00; F23C2700/02; F23C2700/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CH71857A
Cited
US1766989A
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US1905283A
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US1866404A
Cited
US1992953A
Cited
US1994447A
Cited
US2011026A
Cited
US2243909A
Cited
US2363875A
Cited
US2608168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |