US3253889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing chloride impurity from tio2 product
Assignee: EIDP Inc
•
Filing: 1964-06-30
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Granted: 1966-05-31
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Expires: 1984-06-30
Abstract
No abstract record available.
Inventors
- 👤 Hans A Wildt
- 👤 Horace J Rundell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:44
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/0475; C01P; C01P2006/00; C01P2006/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PROCESS FOR QUICKLY REMOVING A CHLORIDE IMPURITY FROM RAW PIGMENTARY TIO2 DIRECTLY RESULTING FROM THE OXIDATION OF TICL4 AT AN ELEVATED TEMPERATURE, WHICH CONSISTS IN SUBJECTING SAID TIO2 WHILE IN AEROSUSPENSION AT A CONCENTRATION RANGING FROM 0.1 TO 20 LBS. OF TIO2 PER CU. FT. OF AEROSUSPENSION TO DIRECT CONTACT FOR A PERIOD OF LESS THAN 5 MINUTES IN A TREATING ZONE MAINTAINED AT A TEMPERATURE RANGING FROM 400 TO 1000*C., WITH A GASEOUS TREATING AGENT SELECTED FROM THE GROUP CONSISTING OF WATER VAPOR, AIR, OXYGEN AND MIXTURES THEREOF, AND THEREAFTER IMMEDIATELY RECOVERING THE PURIFIED TIO2 PRODUCT.
Claim 2
Dependent Claim
98 words
A PROCESS FOR QUICKLY REMOVING A CHLORIDE IMPURITY FROM RAW PIGMENTARY TIO2 DIRECTLY RESULTING FROM THE OXIDATION OF TICL4 AT AN ELEVATED TEMPERATURE, WHICH CONSISTS IN SUBJECTING SAID TIO2 WHILE IN AEROSUSPENSION AT A CONCENTRATION RANGING FROM 0.1 TO 20 LBS. OF TIO2 PER CU. FT. OF AEROSUSPENSION TO DIRECT CONTACT FOR A PERIOD OF LESS THAN 5 MINUTES IN A TREATING ZONE MAINTAINED AT A TEMPERATURE RANGING FROM 400 TO 1000*C., WITH A GASEOUS TREATING AGENT SELECTED FROM THE GROUP CONSISTING OF WATER VAPOR, AIR, OXYGEN AND MIXTURES THEREOF, AND THEREAFTER IMMEDIATELY RECOVERING THE PURIFIED TIO2 PRODUCT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |