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Patent US2500958A successfully refreshed from Google Patents.
US2500958A
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Process for preparing sulfidic pigments
Assignee: Akzo Nobel Paints LLC
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Filing: 1947-11-19
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Granted: 1950-03-21
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Expires: 1967-11-19
Abstract
No abstract record available.
Inventors
- 👤 James J O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:23
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/04; C09C1/06; C01; C01P; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
THE METHOD OF MAKING AN IMPROVED SULFIDIC PIGMENT WHICH COMPRISES THE STEPS OF: PROVIDING AN AQUEUS ALKALI-EARTH METAL SULFIDE SOLUTION; COOLING SAID SOLUTION TO A TEMPERATURE ABOVE ITS FREEZING POINT BUT SUFFICIENTLY LOW TO CAUSE PRECIPITATION OF ALKALI-EARTH METAL HYDROXIDE FROM SAID SOLUTION; MUTUALLY SEPARATING AT LEAST PART OF SAID PRECIPITATE FROM ITS MOTHER LIQUOR; STRIKING THE RESULTING SOLUTION WITH AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SALT OF AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF ZINC AND CADMIUM, THEREBY TO PRODUCE A SULFIDIC PRECIPITATE OF THE METAL OF SAID SOLUBLE SALT AND MUTUALLY SEPARATING SAID SULFIDIC PRECIPITATE FROM THE LIQUORS OF SAID REACTION MASS.
References Cited (Backward Citations)
US2030887A
Cited
US2050802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |