US3423178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tio2 production by chromium removal from beneficiated titaniferous ore
Assignee: EIDP Inc
•
Filing: 1966-08-12
•
Granted: 1969-01-21
•
Expires: 1986-08-12
Abstract
No abstract record available.
Inventors
- 👤 Oswin B Willcox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:32
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1204; C22B34/1209; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/0475
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A METHOD FOR REMOVING A CHROMIUM CONTAMINANT FROM A BENEFICIATED TITANIUM-CONTAINING MATERIAL TO OBTAIN A WHITE, POROUS, PIGMENT-USEFUL TIO2 PRODUCT; COMPRISING INTIMATELY MIXING SAID BENEFICIATED MATERIAL WITH AN EXTRACTANT SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL MOLYBDATES AND TUNGSTATES AND THEIR MIXTURES, CALCINING THE RESULTING MIXTURE AT TEMPERATURE IN THE RANGE OF FROM ABOUT 660*C. TO ABOUT 1050*C. FOR AT LEAST 30 MINUTES IN AN OXIDIZING ATMOSPHERE, REMOVING FROM THE CALCINED PRODUCT WATER-SOLUBLE CHROMIUM COMPOUNDS FORMED IN THE CALCINATION AND RECOVERING THE RESULTING POROUS WHITE TIO2, PRODUCT.
Claim 2
Independent Claim
88 words
A METHOD FOR REMOVING A CHROMIUM CONTAMINANT FROM A BENEFICIATED TITANIUM-CONTAINING MATERIAL TO OBTAIN A WHITE, POROUS, PIGMENT-USEFUL TIO2 PRODUCT; COMPRISING INTIMATELY MIXING SAID BENEFICIATED MATERIAL WITH AN EXTRACTANT SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL MOLYBDATES AND TUNGSTATES AND THEIR MIXTURES, CALCINING THE RESULTING MIXTURE AT TEMPERATURE IN THE RANGE OF FROM ABOUT 660*C. TO ABOUT 1050*C. FOR AT LEAST 30 MINUTES IN AN OXIDIZING ATMOSPHERE, REMOVING FROM THE CALCINED PRODUCT WATER-SOLUBLE CHROMIUM COMPOUNDS FORMED IN THE CALCINATION AND RECOVERING THE RESULTING POROUS WHITE TIO2, PRODUCT.
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) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |