US2618532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making red iron oxide
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1948-12-06
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Granted: 1952-11-18
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Expires: 1968-12-06
Abstract
No abstract record available.
Inventors
- 👤 Atkins Peter James
- 👤 Peel John Buttery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:42
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
PROCESS FOR THE MANUFACTURE OF RED IRON OXIDE PIGMENTS WHICH COMPRISES BLOWING WITH AIR, AN AQUEOUS ALKALINE SUSPENSION OF FERROUS CARBONATE AND MAGNESIUM CARBONATE CONTAINING BETWEEN ABOUT 0.1 AND ABOUT 7.0 PARTS OF CATIONIC MAGNESIUM TO EACH 100 PARTS OF CATIONIC IRON, AT A TEMPPERATURE WHICH AT ALL TIMES DURING THE BLOWING TREATMENT IS BETWEEN 60* C. AND 95* C.
Claim 2
Dependent Claim
60 words
PROCESS FOR THE MANUFACTURE OF RED IRON OXIDE PIGMENTS WHICH COMPRISES BLOWING WITH AIR, AN AQUEOUS ALKALINE SUSPENSION OF FERROUS CARBONATE AND MAGNESIUM CARBONATE CONTAINING BETWEEN ABOUT 0.1 AND ABOUT 7.0 PARTS OF CATIONIC MAGNESIUM TO EACH 100 PARTS OF CATIONIC IRON, AT A TEMPPERATURE WHICH AT ALL TIMES DURING THE BLOWING TREATMENT IS BETWEEN 60* C. AND 95* C.
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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) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |