Patent US6301440B1 successfully refreshed from Google Patents.
US2915367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal oxide production
Assignee: EIDP Inc
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Filing: 1956-04-27
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Granted: 1959-12-01
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Expires: 1976-04-27
Abstract
No abstract record available.
Inventors
- 👤 Olson Carl Marcus
- 👤 Tully John Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:57
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
198 words
A METHOD FOR PRODUCING A TITANIUM DIOXIDE PIGMENT WHICH COMPRISES DECOMPOSING WITHIN A REACTION ZONE IN THE VAPOR PHASE AND AT TEMPERATURE RANGING FROM ABOUT 800-1450* C., A TITANIUM HALIDE WITH AN OXIDATION GAS,THROUGHOUT THE DECOMPOSITION MAINTAINING A FILM OF A CHLORINE-CONTAINING GAS OVER THE INTERNAL SURFACES OF SAID ZONE ADAPTED TO PREVENT SUBSTANTIAL CONTACT OF THE REACTANTS AND REACTION PRODUCTS WITH SAID SURFACES, MAINTAINING SAID FILM THEREOVER BY SLOWLY AND CONTINUOUSLY DIFFUSING SAID CHLORINE-CONTAINING GAS INTO SAID ZONE FROM AN EXTERNAL SOURSE AND THROUGH A POROUS REFRACTORY WALL THE SURFACES OF WHICH ARE MAINTAINED AT FROM 500-800* C., SAID WALL BEING SELECTED FROM THE GROUP CONSISTING OF AMORPHOUS CARBON, GRAPHITE AND MIXTURS THEREOF, HAVING A PORE SIZE OF FROM .05 TO 200 MICRONS AND BEING CAPABLE OF REDUCING IN THE PRESENCE OF CHLORINE TITANIUM OXIDE SCALE COMING IN CONTACT THEREWITH TO A LOWER VALENT TITANIUM COMPOUND FOR REACTION WITH SAID CHLORINE-CONTAINING GAS TO FORM TITANIUM TETRACHLORIDE, MAINTAINING THE WEIGHT RATIO OF CHLORINE GAS PASSED THROUGH SAID POROUS WALL TO BY-PRODUCT HALOGEN PRODUCED IN THE OXIDE TION REACTION WITHIN A RANGE OF .1 TO 1, AND RECOVERING FROM THE REACTION ZONE THE TITANIUM DIOXIDE PIGMENT WHICH FORMS THEREIN.
Claim 2
Independent Claim
198 words
A METHOD FOR PRODUCING A TITANIUM DIOXIDE PIGMENT WHICH COMPRISES DECOMPOSING WITHIN A REACTION ZONE IN THE VAPOR PHASE AND AT TEMPERATURE RANGING FROM ABOUT 800-1450* C., A TITANIUM HALIDE WITH AN OXIDATION GAS,THROUGHOUT THE DECOMPOSITION MAINTAINING A FILM OF A CHLORINE-CONTAINING GAS OVER THE INTERNAL SURFACES OF SAID ZONE ADAPTED TO PREVENT SUBSTANTIAL CONTACT OF THE REACTANTS AND REACTION PRODUCTS WITH SAID SURFACES, MAINTAINING SAID FILM THEREOVER BY SLOWLY AND CONTINUOUSLY DIFFUSING SAID CHLORINE-CONTAINING GAS INTO SAID ZONE FROM AN EXTERNAL SOURSE AND THROUGH A POROUS REFRACTORY WALL THE SURFACES OF WHICH ARE MAINTAINED AT FROM 500-800* C., SAID WALL BEING SELECTED FROM THE GROUP CONSISTING OF AMORPHOUS CARBON, GRAPHITE AND MIXTURS THEREOF, HAVING A PORE SIZE OF FROM .05 TO 200 MICRONS AND BEING CAPABLE OF REDUCING IN THE PRESENCE OF CHLORINE TITANIUM OXIDE SCALE COMING IN CONTACT THEREWITH TO A LOWER VALENT TITANIUM COMPOUND FOR REACTION WITH SAID CHLORINE-CONTAINING GAS TO FORM TITANIUM TETRACHLORIDE, MAINTAINING THE WEIGHT RATIO OF CHLORINE GAS PASSED THROUGH SAID POROUS WALL TO BY-PRODUCT HALOGEN PRODUCED IN THE OXIDE TION REACTION WITHIN A RANGE OF .1 TO 1, AND RECOVERING FROM THE REACTION ZONE THE TITANIUM DIOXIDE PIGMENT WHICH FORMS THEREIN.
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) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |