US2560971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of gamma-ferric oxide hydrate and gamma-ferric oxide
Assignee: Columbian Carbon Co
•
Filing: 1947-07-11
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Granted: 1951-07-17
•
Expires: 1967-07-11
Abstract
No abstract record available.
Inventors
- 👤 Martin John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:13
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
THE METHOD OF PREPARING GAMMA-FERRIC OXIDE HYDRATE WHICH COMPRISES PRECIPITATING THE FERROUS ION FROM A SOLUTION OF FERROUS CHLORIDE WITH A SOLUTION OF A HYDROXIDE OF A METAL OF THE CLASS CONSISTING OF THE ALKALI AND ALKALINE EARTH METALS AT A TEMPERATURE BETWEEN 150* AND 200* F. TO FORM UNTIL THE SLURRY IS THIN, DILUTING AND RAPIDLY TURE UNTIL THE SLURRY IS THIN, DILUTING AND RAPIDLY COOLING THE SLURRY TO ROOM TEMPERATURE, AND OXIDIZING IT AT ROOM TEMPERATURE UNTIL THE PRODUCT HAS A CLEAN ORANGE-YELLOW COLOR.
Claim 2
Independent Claim
86 words
THE METHOD OF PREPARING GAMMA-FERRIC OXIDE HYDRATE WHICH COMPRISES PRECIPITATING THE FERROUS ION FROM A SOLUTION OF FERROUS CHLORIDE WITH A SOLUTION OF A HYDROXIDE OF A METAL OF THE CLASS CONSISTING OF THE ALKALI AND ALKALINE EARTH METALS AT A TEMPERATURE BETWEEN 150* AND 200* F. TO FORM UNTIL THE SLURRY IS THIN, DILUTING AND RAPIDLY TURE UNTIL THE SLURRY IS THIN, DILUTING AND RAPIDLY COOLING THE SLURRY TO ROOM TEMPERATURE, AND OXIDIZING IT AT ROOM TEMPERATURE UNTIL THE PRODUCT HAS A CLEAN ORANGE-YELLOW COLOR.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |