Patent US2804855A successfully refreshed from Google Patents.
US2804855A
Expired / Lapsed
US
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Furnace door construction
Assignee: Surface Combustion Corp
•
Filing: 1952-02-23
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Granted: 1957-09-03
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Expires: 1972-02-23
Abstract
No abstract record available.
Inventors
- 👤 Bergman Herbert Lincoln
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:09
CPC Classifications
F; F23; F23M; F23M7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1351914A
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US1680365A
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US1818759A
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US2208705A
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US2435318A
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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) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |