US2866686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of red oxide of iron
Assignee: C K Williams & Co
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Filing: 1956-09-13
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Granted: 1958-12-30
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Expires: 1976-09-13
Abstract
No abstract record available.
Inventors
- 👤 Leonard M Bennetch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:09
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/22; C09C1/24; C01; C01G; C01G49/00; C01G49/02; C01G49/06; C01P; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/60; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS OF MANUFACTURING PRECIPITATED RED FERRIC OXIDE WHICH COMPRISES FORMING COLLOIDAL SEED PARTICLES OF HYDROUS IRON OXIDE BY MIXING TOGETHER AND REACTING A FERROUS SALT AND AN ALKALI IN AQUEOUS SOLUTION, THE ALKALI BEING USED IN THE PROPORTION OF 0.9 TO 1.1 EQUIVALENTS PER EQUIVALENT OF FERROUS SALT, AND OXIDIZING THE FERROUS PRECIPITATE FORMED IN THE SLURRY TO THE FERRIC STATE, AND THEREUPON EFFECTING THE GROWTH OF RED FERRIC OXIDE UPON SAID SEED BY HEATING TO 50*-100*C. AND INTRODUCING OXYGEN INTO THE RESULTING SLURRY CONTANING SAID SEED, ADDING AN IRON SALT AND ALKALI TO THE SLURRY WHEREIN THEY DISSOLVE AND DICONTINUING THE OPERATIONS WHEN THE SLURRY HAS REACHED THE COLOR CORRESPONDING TO THE SHADE OF RED PIGMENT DESIRED.
Claim 2
Dependent Claim
119 words
A PROCESS OF MANUFACTURING PRECIPITATED RED FERRIC OXIDE WHICH COMPRISES FORMING COLLOIDAL SEED PARTICLES OF HYDROUS IRON OXIDE BY MIXING TOGETHER AND REACTING A FERROUS SALT AND AN ALKALI IN AQUEOUS SOLUTION, THE ALKALI BEING USED IN THE PROPORTION OF 0.9 TO 1.1 EQUIVALENTS PER EQUIVALENT OF FERROUS SALT, AND OXIDIZING THE FERROUS PRECIPITATE FORMED IN THE SLURRY TO THE FERRIC STATE, AND THEREUPON EFFECTING THE GROWTH OF RED FERRIC OXIDE UPON SAID SEED BY HEATING TO 50*-100*C. AND INTRODUCING OXYGEN INTO THE RESULTING SLURRY CONTANING SAID SEED, ADDING AN IRON SALT AND ALKALI TO THE SLURRY WHEREIN THEY DISSOLVE AND DICONTINUING THE OPERATIONS WHEN THE SLURRY HAS REACHED THE COLOR CORRESPONDING TO THE SHADE OF RED PIGMENT DESIRED.
References Cited (Backward Citations)
US2388659A
Cited
US2696426A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-29 | 1962-06-30 | 1962-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-29 | 1966-06-30 | 1966-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-29 | 1970-06-30 | 1970-12-30 | $7700.00 | Window Closed / Lapsed |