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Patent US2536783A successfully refreshed from Google Patents.
US2536783A
Expired / Lapsed
US
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Apparatus for producing activated carbon
Assignee: Colorado Fuel and Iron Corp
•
Filing: 1948-03-04
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Granted: 1951-01-02
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Expires: 1968-03-04
Abstract
No abstract record available.
Inventors
- 👤 Kenneth B Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:45
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/39
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1563295A
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US1502592A
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US1913968A
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US1955025A
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AU1859634A
Cited
US2131702A
Cited
US2162763A
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US2471119A
Cited
US2446805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |