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Patent US3778387A successfully refreshed from Google Patents.
US3778387A
Expired / Lapsed
US
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Activated carbon with antioxidant properties and a method of preparing the same
Assignee: Calgon Carbon Corp
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Filing: 1971-06-21
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Granted: 1973-12-11
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Expires: 1991-06-21
Abstract
Abstract AN ACTIVATED CARBON WITH ANTIOXIDANT PROPERTIES IS PREPARED BY FIRST ACID WASHING THE CARBON TO REMOVE ASH, THEN AIR OXIDIZING THE CARBON, AND FINALLY IMPREGNATING THE CARBON WITH A KETONE.
Inventors
- 👤 J Urbanic
- 👤 R Sutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:48
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/342; C01B32/348
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |