Patent US2691571A successfully refreshed from Google Patents.
US2691571A
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Titanium dioxide manufacture
Assignee: EIDP Inc
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Filing: 1952-09-25
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Granted: 1954-10-12
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Expires: 1972-09-25
Abstract
No abstract record available.
Inventors
- 👤 Holger H Schaumann
- 👤 Ignace J Krchma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:25
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A PROCESS FOR PRODUCING AN IMPROVED TITANIUM DIOXIDE PIGMENT WHICH COMPRISES REACTING BY MIXING WITHIN A CLOSED REACTION ZONE AT AN ELEVATED TEMPERATURE RANGING FROM 800-1350* C. VAPORIZED TITANIUM TETRACHLORIDE IN THE PRESENCE OF A MINOR AMOUNT OF A SUBCHLORIDE OF TITANIUM AS A NUCLEATING AGENT WITH AN OXYGENCONTAINING GAS AND THEREAFTER RECOERING THE RESULTING TIO2 REACTION PRODUCT.
Claim 2
Dependent Claim
58 words
A PROCESS FOR PRODUCING AN IMPROVED TITANIUM DIOXIDE PIGMENT WHICH COMPRISES REACTING BY MIXING WITHIN A CLOSED REACTION ZONE AT AN ELEVATED TEMPERATURE RANGING FROM 800-1350* C. VAPORIZED TITANIUM TETRACHLORIDE IN THE PRESENCE OF A MINOR AMOUNT OF A SUBCHLORIDE OF TITANIUM AS A NUCLEATING AGENT WITH AN OXYGENCONTAINING GAS AND THEREAFTER RECOERING THE RESULTING TIO2 REACTION PRODUCT.
References Cited (Backward Citations)
US1850286A
Cited
US2240343A
Cited
US2178685A
Cited
US2184884A
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US2306184A
Cited
US2488439A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |