Patent US2920976A successfully refreshed from Google Patents.
US2920976A
Expired / Lapsed
US
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Treatment of acidic carbon blacks
Assignee: Sherwin Williams Co
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Filing: 1953-02-24
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Granted: 1960-01-12
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Expires: 1973-02-24
Abstract
No abstract record available.
Inventors
- 👤 Damusis Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:31
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
THE METHOD OF CONDITIONING AN ACIDIC CARBON BLACK COMPRISING INTIMATELY CONTACTING A FINELY DIVIDED CARBON BLACK HAVING A MAXIMUM PH OF ABOUT 6 WITH A SOLUTION OF A SALT OF A HEAVY METAL AND AN ALIPHATIC CARBOXYLIC ACID AND WASHING THE PRODUCT WITH A SOLVENT IN WHICH THE FREE ACID FORMED IS SOLUBLE.
Claim 2
Independent Claim
53 words
THE METHOD OF CONDITIONING AN ACIDIC CARBON BLACK COMPRISING INTIMATELY CONTACTING A FINELY DIVIDED CARBON BLACK HAVING A MAXIMUM PH OF ABOUT 6 WITH A SOLUTION OF A SALT OF A HEAVY METAL AND AN ALIPHATIC CARBOXYLIC ACID AND WASHING THE PRODUCT WITH A SOLVENT IN WHICH THE FREE ACID FORMED IS SOLUBLE.
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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) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |