Patent US2930775A successfully refreshed from Google Patents.
US2930775A
Expired / Lapsed
US
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Pigment pastes containing water-soluble diisobutylene-maleic anhydride copolymer salts
Assignee: Rohm and Haas Co
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Filing: 1958-10-14
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Granted: 1960-03-29
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Expires: 1978-10-14
Abstract
No abstract record available.
Inventors
- 👤 David B Fordyce
- 👤 Charles L Levesque
- 👤 Warren D Niederhauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:58
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A PIGMENT PASTE COMPRISING AN AQUEOUS SUSPENSION OF FINELY DIVIDED WATER-INSOLUBLE PIGMENT DISPERSED WITH AT LEAST ABOUT 0.05%, ON THE WEIGHT OF PIGMENT, OF A POLYMERIC DISPERSANT CONSISTING OF A WATER-SOLUBLE SALT SELECTED FROM THE GROUP CONSISTING OF AMMONIUM AND ALKALI METAL SALTS OF A POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF A RELATIVELY HOMOGENEOUS COPOLYMER, HAVING A MOLECULAR WEIGHT BETWEEN 750 AND 5,000 OF MALEIC ANHYDRIDE AND DISOBUTYLENE IN APPROXIMATELY EQUIMOLECULAR PROPORTIONS AND MIXTURES OF SUCH COPOLYMERS, SAID POLYMERIC MATERIAL IMPARTING TO A 35% SOLUTION IN AN ORGANIC SOLVENT THEREFOR SELECTED FROM THE CLASS CONSISTING OF DIOXANE AND METHYL ETHYL KETONE A VISCOSITY LESS THAN 1,000 CENTIPOISES AT 25*C., THE SUSPENSION HAVING A PH OF AT LEAST 4.5 TO 12.
Claim 2
Dependent Claim
122 words
A PIGMENT PASTE COMPRISING AN AQUEOUS SUSPENSION OF FINELY DIVIDED WATER-INSOLUBLE PIGMENT DISPERSED WITH AT LEAST ABOUT 0.05%, ON THE WEIGHT OF PIGMENT, OF A POLYMERIC DISPERSANT CONSISTING OF A WATER-SOLUBLE SALT SELECTED FROM THE GROUP CONSISTING OF AMMONIUM AND ALKALI METAL SALTS OF A POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF A RELATIVELY HOMOGENEOUS COPOLYMER, HAVING A MOLECULAR WEIGHT BETWEEN 750 AND 5,000 OF MALEIC ANHYDRIDE AND DISOBUTYLENE IN APPROXIMATELY EQUIMOLECULAR PROPORTIONS AND MIXTURES OF SUCH COPOLYMERS, SAID POLYMERIC MATERIAL IMPARTING TO A 35% SOLUTION IN AN ORGANIC SOLVENT THEREFOR SELECTED FROM THE CLASS CONSISTING OF DIOXANE AND METHYL ETHYL KETONE A VISCOSITY LESS THAN 1,000 CENTIPOISES AT 25*C., THE SUSPENSION HAVING A PH OF AT LEAST 4.5 TO 12.
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) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |