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US2636688A
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US
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Method for treating coal and the like
Assignee: Gas Technology Institute
•
Filing: 1948-02-20
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Granted: 1953-04-28
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Expires: 1968-02-20
Abstract
No abstract record available.
Inventors
- 👤 Alamjit D Singh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:25
CPC Classifications
B; B02; B02C; B02C19/00; B02C19/06; Y; Y10; Y10S; Y10S48/00; Y10S48/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US369836A
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US1578609A
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US1922313A
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US2032827A
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US2184300A
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US2392866A
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US2306462A
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US2385508A
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US2515541A
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US2515542A
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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) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |