US2605167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing improved sulfidic pigments
Assignee: Akzo Nobel Paints LLC
•
Filing: 1948-08-20
•
Granted: 1952-07-29
•
Expires: 1968-08-20
Abstract
No abstract record available.
Inventors
- 👤 James J O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:50
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/04; C09C1/06; C09C1/10; C09C1/12; C01; C01P; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
THE METHOD OF MAKING AN IMPROVED SULFIDIC PIGMENT WHICH COMPRISES THE STEPS OF: PROVIDING AN AQUEOUS SOLUTION OF A METAL SULFIDE SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL SULFIDES AND BARIUM SULFIDE; REACTING SAID METAL SULFIDE SOLUTION WITH A WATER-SOLUBLE SALT OF A SECONDGROUP METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM AND MAGNESIUM TO PRECIPITATE AN INSOLUBLE HYDRATE OF THE SAID SECOND-GROUP METAL AND THEREBY TO ESTABLISH IN SAID SULFIDE SOLUTION AN SH/OH RATIO IN EXCESS OF 1 TO 1; SEPARATING SAID INSOLUBLE HYDRATE FROM ITS MOTHER LIQUID; STRIKING THE RESULTING MOTHER LIQUID HAVING AN SH/OH RATIO IN EXCESS OF 1 TO 1 WITH AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SALT OF AT LEAST ONE PIGMENT METAL SELECTED FROM THE GROUP CONSISTING OF ZINC AND CADMIUM, THEREBY TO PRODUCE A SULFIDIC PRECIPITATE OF THE SAID PIGMENT METAL; AND SEPARATING SAID SULFIDIC PRECIPITATE FROM THE LIQUORS OF THE STRIKE SLURRY.
Claim 2
Independent Claim
151 words
THE METHOD OF MAKING AN IMPROVED SULFIDIC PIGMENT WHICH COMPRISES THE STEPS OF: PROVIDING AN AQUEOUS SOLUTION OF A METAL SULFIDE SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL SULFIDES AND BARIUM SULFIDE; REACTING SAID METAL SULFIDE SOLUTION WITH A WATER-SOLUBLE SALT OF A SECONDGROUP METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM AND MAGNESIUM TO PRECIPITATE AN INSOLUBLE HYDRATE OF THE SAID SECOND-GROUP METAL AND THEREBY TO ESTABLISH IN SAID SULFIDE SOLUTION AN SH/OH RATIO IN EXCESS OF 1 TO 1; SEPARATING SAID INSOLUBLE HYDRATE FROM ITS MOTHER LIQUID; STRIKING THE RESULTING MOTHER LIQUID HAVING AN SH/OH RATIO IN EXCESS OF 1 TO 1 WITH AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SALT OF AT LEAST ONE PIGMENT METAL SELECTED FROM THE GROUP CONSISTING OF ZINC AND CADMIUM, THEREBY TO PRODUCE A SULFIDIC PRECIPITATE OF THE SAID PIGMENT METAL; AND SEPARATING SAID SULFIDIC PRECIPITATE FROM THE LIQUORS OF THE STRIKE SLURRY.
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) | 1955-07-29 | 1956-01-28 | 1956-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-29 | 1960-01-28 | 1960-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-29 | 1964-01-28 | 1964-07-29 | $7700.00 | Window Closed / Lapsed |