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Patent US2655138A successfully refreshed from Google Patents.
US2655138A
Expired / Lapsed
US
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Air heater mounted in the convection section of furnaces
Assignee: Kennedy Van Saun Manufacturing and Engineering Corp
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Filing: 1950-11-09
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Granted: 1953-10-13
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Expires: 1970-11-09
Abstract
No abstract record available.
Inventors
- 👤 Falla Fernando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:36
CPC Classifications
F; F23; F23K; F23K1/00; F23K1/04; F23L; F23L15/00; F23L15/04; Y; Y02; Y02E; Y02E20/00; Y02E20/34; Y10; Y10S; Y10S122/00; Y10S122/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |