Patent US3775149A successfully refreshed from Google Patents.
US3775149A
Expired / Lapsed
US
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Preparation of pigments
Assignee: Novartis AG
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Filing: 1971-11-18
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Granted: 1973-11-27
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Expires: 1991-11-18
Abstract
Abstract A process in which phthalocyanine pigment is produced at least 80 percent in the Beta -pigmentary form by grinding a dispersed suspension of crude pigment in aqueous medium, preferably with particulate grinding elements which are insoluble in the aqueous medium, containing from 5 to 10 percent of surface active agent until the pigment flocculates and the system is converted into a filterable paste and by recovering the pigmentary phthalocyanine from the paste by filtration, the filterable paste of the phthalocyanine pigment and the phthalocyanine pigment prepared by the process.
Inventors
- 👤 R Langley
- 👤 W Warwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:34
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0022; C09B67/0023; C09B67/0025; C09B67/0026
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
24 words
A process according to claim 1 in which the crude pigment is ground with particulate grinding elements which are insoluble in the aqueous medium.
Claim 2
Dependent Claim
21 words
A process according to claim 2 in which the phthalocyanine produced is at least 95 percent in the Beta pigmentary form.
Claim 3
Dependent Claim
28 words
A process according to claim 2 in which the total time of grinding is between 1 1/2 and 2 times the time taken to initially flocculate the pigment.
Claim 4
Dependent Claim
16 words
A process according to claim 2 in which there is used 5-8.8 percent surface active agent.
Claim 5
Dependent Claim
19 words
A process according to claim 5 in which the surface active agent used is or may be rendered water-soluble.
Claim 6
Dependent Claim
18 words
A process according to claim 2 in which the pigment is filtered from the paste, washed and dried.
Claim 7
Dependent Claim
30 words
A process according to claim 2 in which the filterable paste is treated with hydrochloric acid at elevated temperature, and the pigment then filtered from the paste, washed and dried.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |