US2560970A
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
•
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
2026-10-25 19:23
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE METHOD OF PREPARING GAMMA-FERRIC OXIDE HYDRATE WHICH COMPRISES PRECIPITATING THE FERROUS ION FROM A SOLUTION OF A HYDROXIDE OF A METAL OF THE 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 A THICK SLURRY, MAINTAINING THE TEMPERATURE UNTIL THE SLURRYIS 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
87 words
THE METHOD OF PREPARING GAMMA-FERRIC OXIDE HYDRATE WHICH COMPRISES PRECIPITATING THE FERROUS ION FROM A SOLUTION OF A HYDROXIDE OF A METAL OF THE 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 A THICK SLURRY, MAINTAINING THE TEMPERATURE UNTIL THE SLURRYIS 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 |