Patent US2657501A successfully refreshed from Google Patents.
US2657501A
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Method for gasifying coal
Assignee: Phillips Petroleum Co
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Filing: 1949-09-12
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Granted: 1953-11-03
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Expires: 1969-09-12
Abstract
No abstract record available.
Inventors
- 👤 Bertrand J Mayland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:49
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/02; C10J3/06; C10J3/12; C10J3/46; C10J3/48; C10J3/482; C10J3/72; C10J3/74; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/093; C10J2300/0943; C10J2300/0953; C10J2300/0973; C10J2300/0976; C10J2300/0983; C10J2300/0993; C10J2300/18; C10J2300/1861; C10J2300/1884; C10J2300/1892; Y; Y10; Y10S; Y10S48/00; Y10S48/04
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) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |