US3758322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rutile tio2 slurries
Assignee: KEMIRA Inc A GA CORP
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Filing: 1971-07-21
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Granted: 1973-09-11
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Expires: 1991-07-21
Abstract
Abstract PIGMENT SLURRIES OF AT LEAST ABOUT 60% TO 80% BY WEIGHT SOLIDS CONTENT ARE OBTAINED BY FLOCCULATING A GRITFREE ANHYDROUS PIGMENT SLURRY OF ABOUT 20% BY WEIGHT SOLIDS, WHICH AFTER INTERMEDIATE WASHING AND DEWATERING IS RESLURRIED IN THE PRESENCE OF A DISPERSANT SUCH AS 2AMINO-2-METHYL-1-PROPANOL. SUCH SLURRIES, PREFERABLY OF RUTILE PIGMENT, ARE HIGHLY USEFUL IN THE PRODUCTION OF COATED PAPER AND WATER BASED PAINTS.
Inventors
- 👤 G Roberts
- 👤 J Rowland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:42
CPC Classifications
C; C09; C09D; C09D17/00; C09D17/004; C09D17/007; C09D17/008; D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; D21H19/385; D21H19/44; D21H19/46
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |