US2488689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endless grate stoker comprising air feed and siftings removal means
Assignee: Riley Power Inc
•
Filing: 1946-02-25
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Granted: 1949-11-22
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Expires: 1966-02-25
Abstract
No abstract record available.
Inventors
- 👤 Eric H Smith
- 👤 Oscar A Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:36
CPC Classifications
F; F23; F23H; F23H11/00; F23H11/18; F23H11/24; F23H11/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US851054A
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US835409A
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US1672563A
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US1698113A
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US1887153A
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US1707893A
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GB309843A
Cited
US1961552A
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US1943780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |