US3244481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing fibrous titanium dioxide and compositions useful in production therefor
Assignee: EIDP Inc
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Filing: 1964-10-05
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Granted: 1966-04-05
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Expires: 1984-10-05
Abstract
No abstract record available.
Inventors
- 👤 Berry Kenneth Lester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:55
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01P; C01P2004/00; C01P2004/10; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS FOR PREPARING FIBROUS TITANIUM DIOXIDE WHICH COMPRISES DISSOLVING IN A NONOXIDIZING ATMOSPHERE TITANIUM DIOXIDE IN A MATRIX OF CRYOLITE AND AT LEAST ONE ALKALI METAL-CONTAINING SUBSTANCE, SAID MATRIX HAVING A FREEZING POINT BELWO 825*C., SAID TITANIUM DIOXIDE BEING PRESENT IN AN AMOUNT TO SATURATE SAID MATRIX WHEN SAID MATRIX HAS A TEMPERATURE BETWEEN ITS FREEZING POINT AND 825*C., AND COOLING AT LEAST A PORTION OF THE MELTED TITANIUM DIOXIDE-CONTAINING MATRIX TO CAUSE CRYSTALLIZATION OF FIBROUS TITANIUM DIOXIDE IN SAID PORTION.
Claim 2
Dependent Claim
82 words
A PROCESS FOR PREPARING FIBROUS TITANIUM DIOXIDE WHICH COMPRISES DISSOLVING IN A NONOXIDIZING ATMOSPHERE TITANIUM DIOXIDE IN A MATRIX OF CRYOLITE AND AT LEAST ONE ALKALI METAL-CONTAINING SUBSTANCE, SAID MATRIX HAVING A FREEZING POINT BELWO 825*C., SAID TITANIUM DIOXIDE BEING PRESENT IN AN AMOUNT TO SATURATE SAID MATRIX WHEN SAID MATRIX HAS A TEMPERATURE BETWEEN ITS FREEZING POINT AND 825*C., AND COOLING AT LEAST A PORTION OF THE MELTED TITANIUM DIOXIDE-CONTAINING MATRIX TO CAUSE CRYSTALLIZATION OF FIBROUS TITANIUM DIOXIDE IN SAID PORTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |