US2560338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromic oxide production particularly for pigment purposes
Assignee: C K Williams & Co
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Filing: 1950-05-16
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Granted: 1951-07-10
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Expires: 1970-05-16
Abstract
No abstract record available.
Inventors
- 👤 Clifford G Frayne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:15
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/34; C09C1/346; C01; C01G; C01G37/00; C01G37/02; C01P; C01P2004/00; C01P2004/51
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PROCESS FOR PRODUCING CHROMIC OXIDE FOR PIGMENT PURPOSES WHICH COMPRISES, REACTING SODIUM CHROMATE WITH SODIUM THIOSULFATE IN AQUEOUS SOLUTION IN THE PRESENCE OF AN AMOUNT OF WATER WHICH UPON THE COMPLETION OF THE EXOTHERMIC REACTION PROVIDES A SOLID, DRY-TO MOIST REACTION PRODUCT, SUBJECTING THE REACTION MASS TO AGITATION AS THE SAME THICKENS AND SOLIDIFIES, THEREBY PRODUCING THE HYDRATED CHROMIUM OXIDE IN THE FORM OF DRY-TO-MOIST PARTICLES INSTEAD OF AS A SINGLE SOLID MASS, CONVEYING SAID PARTICLES TO A KILN AND CALCINING THE SAME, THEREBY PRODUCING THE CHROMIC OXIDE.
Claim 2
Dependent Claim
89 words
A PROCESS FOR PRODUCING CHROMIC OXIDE FOR PIGMENT PURPOSES WHICH COMPRISES, REACTING SODIUM CHROMATE WITH SODIUM THIOSULFATE IN AQUEOUS SOLUTION IN THE PRESENCE OF AN AMOUNT OF WATER WHICH UPON THE COMPLETION OF THE EXOTHERMIC REACTION PROVIDES A SOLID, DRY-TO MOIST REACTION PRODUCT, SUBJECTING THE REACTION MASS TO AGITATION AS THE SAME THICKENS AND SOLIDIFIES, THEREBY PRODUCING THE HYDRATED CHROMIUM OXIDE IN THE FORM OF DRY-TO-MOIST PARTICLES INSTEAD OF AS A SINGLE SOLID MASS, CONVEYING SAID PARTICLES TO A KILN AND CALCINING THE SAME, THEREBY PRODUCING THE CHROMIC OXIDE.
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) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |