US2960387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of chromium from titanium dioxide product
Assignee: HORIZOUS Inc
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Filing: 1958-03-14
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Granted: 1960-11-15
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Expires: 1978-03-14
Abstract
No abstract record available.
Inventors
- 👤 Wainer Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:19
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1204; C22B34/1213; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/0475; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS FOR UPGRADING IMPURE TITANIUM DIOXIDE BY REMOVING COMPOUNDS OF CHROMIUM THEREFROM, WHICH COMPRISES: SUBJECTING THE SOLIDS PRODUCED AFTER HCI DIGESTION OF THE IMPURE MATERIAL TO TREATMENT WITH A DILUTE AQUEOUS SOLUTION OF CAUSTIC SODA AND ALAKLI METAL PEROXIDE AT ABOUT 80* TO 95*C. FOR A TIME SUFFICIENT TO DISSOLVE THE COMPOUNDS OF CHROMIUM AND TO THEREBY DIMINISH THE CHROMIUM CONTENT OF THE REMAINING SOLIDS TO BELOW AN AMOUNT DETRIMENTAL TO THEIR USE IN THE MANUFACTURE OF PORCELAIN ENAMELS.
Claim 2
Dependent Claim
80 words
A PROCESS FOR UPGRADING IMPURE TITANIUM DIOXIDE BY REMOVING COMPOUNDS OF CHROMIUM THEREFROM, WHICH COMPRISES: SUBJECTING THE SOLIDS PRODUCED AFTER HCI DIGESTION OF THE IMPURE MATERIAL TO TREATMENT WITH A DILUTE AQUEOUS SOLUTION OF CAUSTIC SODA AND ALAKLI METAL PEROXIDE AT ABOUT 80* TO 95*C. FOR A TIME SUFFICIENT TO DISSOLVE THE COMPOUNDS OF CHROMIUM AND TO THEREBY DIMINISH THE CHROMIUM CONTENT OF THE REMAINING SOLIDS TO BELOW AN AMOUNT DETRIMENTAL TO THEIR USE IN THE MANUFACTURE OF PORCELAIN ENAMELS.
References Cited (Backward Citations)
CA537000A
Cited
US1206797A
Cited
US1845633A
Cited
US2357988A
Cited
US2842428A
Cited
US2875107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-15 | 1964-05-16 | 1964-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-15 | 1968-05-16 | 1968-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-15 | 1972-05-16 | 1972-11-15 | $7700.00 | Window Closed / Lapsed |