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Patent US2438148A successfully refreshed from Google Patents.
US2438148A
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Crude anthracene separation
Assignee: Beazer East Inc
•
Filing: 1945-02-01
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Granted: 1948-03-23
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Expires: 1965-02-01
Abstract
No abstract record available.
Inventors
- 👤 Corson Ben Bennett
- 👤 Detrick Robert Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:48
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/163; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1965956A
Cited
US1591712A
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US1897798A
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US1940065A
Cited
US1999738A
Cited
FR687957A
Cited
US1972157A
Cited
US1939224A
Cited
FR733704A
Cited
FR813647A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-23 | 1951-09-22 | 1952-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-23 | 1955-09-22 | 1956-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-23 | 1959-09-22 | 1960-03-23 | $7700.00 | Window Closed / Lapsed |