Patent US3006728A successfully refreshed from Google Patents.
US3006728A
Expired / Lapsed
US
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Preparation of ceramic grade titanium dioxide
Assignee: Horizons Inc
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Filing: 1959-09-10
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Granted: 1961-10-31
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Expires: 1979-09-10
Abstract
No abstract record available.
Inventors
- 👤 Wainer Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:18
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1204; C22B34/1209
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
121 words
A PROCESS FOR PURIFYING A TITANIUM DIOXIDE MATERIAL CONTAMINATED WITH COMPOUNDS OF METALS WHICH FORM COLORED OXIDES AND THEREBY DISQUALIFY THE MATERIAL AS A CERAMIC GRADE TIO2 WHICH COMPRISES: CHLORINATING THE IMPURITIES IN A CARBON-FREE CHARGE OF SAID MATERIAL AT A TEMPERATURE BETWEEN ABOUT 500*C. AND 850*C. BY CONTACTING SAID MATERIAL IN FINELY DIVIDED FORM WITH A MIXTURE OF MOIST AIR AND CHLORINATING GAS SELECTED FROM THE GROUP CONSISTING OF HCL, CL2, COCL2 AND MIXTURES THEREOF, CONTAINING IN ADDITION TO THE MOISTUE ORIGINALLY PRESENT IN THE GASES CONSTITUTING SAID MIXTURE, SUFFICIENT ADDITIONAL MOISTURE TO INCREASE THE MOISTURE IN SAID MIXTURE TO BETWEEN 0.5% AND 5% OF WATER VAPOR, WHICH IS AN AMOUNT OF WATER VAPOR SUFFICIENT TO INHIBIT CHLORINATION OF THE
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) | 1964-10-30 | 1965-05-01 | 1965-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-30 | 1969-05-01 | 1969-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-30 | 1973-05-01 | 1973-10-31 | $7700.00 | Window Closed / Lapsed |