Patent FR451735A successfully refreshed from Google Patents.
Patent US2653555A successfully refreshed from Google Patents.
US2653555A
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Downflow stoker-fed furnace system for bituminous coals
Assignee: Bituminous Coal Research Inc
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Filing: 1949-05-16
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Granted: 1953-09-29
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Expires: 1969-05-16
Abstract
No abstract record available.
Inventors
- 👤 Willard J Hatton
- 👤 Ralph A Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:59
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/18; F24H9/1809; F24H9/1832; F24H9/1845; F23; F23H; F23H9/00; F23H9/02; F23K; F23K3/00; F24H1/00; F24H1/22; F24H1/24; F24H1/26; F24H1/28; F23H2700/00; F23H2700/005; F23K2203/00; F23K2203/002; F24H2230/00
Claims Analysis
Total Claims: 0
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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) | 1956-09-28 | 1957-03-30 | 1957-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-28 | 1961-03-30 | 1961-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-28 | 1965-03-30 | 1965-09-29 | $7700.00 | Window Closed / Lapsed |