Patent US2689781A successfully refreshed from Google Patents.
US2689781A
Expired / Lapsed
US
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Production of titanium dioxide pigments
Assignee: EIDP Inc
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Filing: 1951-07-05
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Granted: 1954-09-21
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Expires: 1971-07-05
Abstract
No abstract record available.
Inventors
- 👤 Holger H Schaumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:57
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS FOR PRODUCING PIGMENTARY RUTILE TITANIUM DIOXIDE WHICH COMPRISES REACTING VAPORIZED TITANIUM TETRACHLORIDE HEATED TO A TEMPERATURE NOT EXCEEDING 400* C. AND A SMALL AMOUNT OF MOLTEN ALUMINUM METAL IN DISPERSED STATE WITH AN OXYGEN-CONTAINING GAS HAVING A REGULATED MOISTURE CONTENT RANGING OF FROM .05-10% BY VOLUME OF H2O, EFFECTING SAID REACTION IN A CLOSED REACTION VESSEL AND AT TEMPERATURES RANGING FROM ABOUT 800-1400* C., AND SUBJECTING THE RECOVERED TIO2 PRODUCT TO PIGMENT-FINISHING TREATMENT.
Claim 2
Dependent Claim
75 words
A PROCESS FOR PRODUCING PIGMENTARY RUTILE TITANIUM DIOXIDE WHICH COMPRISES REACTING VAPORIZED TITANIUM TETRACHLORIDE HEATED TO A TEMPERATURE NOT EXCEEDING 400* C. AND A SMALL AMOUNT OF MOLTEN ALUMINUM METAL IN DISPERSED STATE WITH AN OXYGEN-CONTAINING GAS HAVING A REGULATED MOISTURE CONTENT RANGING OF FROM .05-10% BY VOLUME OF H2O, EFFECTING SAID REACTION IN A CLOSED REACTION VESSEL AND AT TEMPERATURES RANGING FROM ABOUT 800-1400* C., AND SUBJECTING THE RECOVERED TIO2 PRODUCT TO PIGMENT-FINISHING TREATMENT.
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) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |