US2555374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for chlorinating titanium oxide material
Assignee: NL Industries Inc
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Filing: 1949-11-02
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Granted: 1951-06-05
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Expires: 1969-11-02
Abstract
No abstract record available.
Inventors
- 👤 Lancelot W Rowe
- 👤 Sandford S Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:24
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1218; C22B34/1222; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A METHOD FOR CHLORINATING FINELY DIVIDED TITANIUM DIOXIDE MATERIAL OF A SIZE LESS THAN 325 MESH WHICH COMPRISES INTRODUCING SAID TITANIUM DIOXIDE AND CHLORINE GAS INTO A REACTOR CONTAINING COARSE PARTICLES FORMING A SUSPENDED BED AT A TEMPERATURE OF 700* C. TO 1000* C. IN THE PRESENCE OF CARBON TO FORM GASES OF TITANIUM TETRACHLORIDE AND OXIDES OF CARBON, SAID CHLORINE GAS BEING INTRODUCED AT SUFFICIENT VELOCITY TO MAINTAIN THE BED SUSPENDED IN AGITATED CONDITION BUT INSUFFICIENT TO CARRY THE COARSE PARTICLES OF SAID BED OUT OF SAID REACTOR, SAID PARTICLES BEING SUBSTANTIALLY ALL OF SIZE WITHIN THE RANGE OF FROM 20 TO 120 MESH, SAID PARTICLES BIENG OF LESSER REACTIVITY WITH CHLORINE GAS THAN SAID FINELY DIVIDED MATERIAL, AND THE AMOUNT OF CHLORINE GAS ADDED SUBSTANTIALLY EQUAL TO THAT REQUIRED TO THEORETICALLY CONVERT ALL OF THE FINELY DIVIDED TITANIUM DIOXIDE TO TITANIUM TETRACHLORIDE.
Claim 2
Independent Claim
144 words
A METHOD FOR CHLORINATING FINELY DIVIDED TITANIUM DIOXIDE MATERIAL OF A SIZE LESS THAN 325 MESH WHICH COMPRISES INTRODUCING SAID TITANIUM DIOXIDE AND CHLORINE GAS INTO A REACTOR CONTAINING COARSE PARTICLES FORMING A SUSPENDED BED AT A TEMPERATURE OF 700* C. TO 1000* C. IN THE PRESENCE OF CARBON TO FORM GASES OF TITANIUM TETRACHLORIDE AND OXIDES OF CARBON, SAID CHLORINE GAS BEING INTRODUCED AT SUFFICIENT VELOCITY TO MAINTAIN THE BED SUSPENDED IN AGITATED CONDITION BUT INSUFFICIENT TO CARRY THE COARSE PARTICLES OF SAID BED OUT OF SAID REACTOR, SAID PARTICLES BEING SUBSTANTIALLY ALL OF SIZE WITHIN THE RANGE OF FROM 20 TO 120 MESH, SAID PARTICLES BIENG OF LESSER REACTIVITY WITH CHLORINE GAS THAN SAID FINELY DIVIDED MATERIAL, AND THE AMOUNT OF CHLORINE GAS ADDED SUBSTANTIALLY EQUAL TO THAT REQUIRED TO THEORETICALLY CONVERT ALL OF THE FINELY DIVIDED TITANIUM DIOXIDE TO TITANIUM TETRACHLORIDE.
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) | 1954-06-04 | 1954-12-04 | 1955-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-04 | 1958-12-04 | 1959-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-04 | 1962-12-04 | 1963-06-05 | $7700.00 | Window Closed / Lapsed |