US3178264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of tio2 pigments of improved color by sulfate process
Assignee: Wyeth Holdings LLC
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Filing: 1962-09-28
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Granted: 1965-04-13
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Expires: 1982-09-28
Abstract
No abstract record available.
Inventors
- 👤 Gerard M Sheehan
- 👤 Earl R Lawhorne
- 👤 Horace A Bragg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:03
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/0475; C01P; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A PROCESS FOR PURIFYING HYDROUS TITANIA CONTAINING COLOR-FORMING POLYVALENT METAL IONS, WHICH COMPRISES CONTACTING SAID HYDROUS TITANIA WITH AN AQUEOUS SOLUTION CONTAINING BETWEEN 0.05% AND 5%, BASED ON THE TIO2 EQUIVALENT OF SAID HYDROUS TITANIA, OF AN ESSENTIALLY NONIONIC POLYHYDRIC ALCOHOL, THEREBY SOLUBILIZING AT LEAST PART OF SAID IONS, AND THEREAFTER REMOVING SAID SOLUTION CONTAINING SAID SOLUBILIZED IONS.
Claim 2
Dependent Claim
58 words
A PROCESS FOR PURIFYING HYDROUS TITANIA CONTAINING COLOR-FORMING POLYVALENT METAL IONS, WHICH COMPRISES CONTACTING SAID HYDROUS TITANIA WITH AN AQUEOUS SOLUTION CONTAINING BETWEEN 0.05% AND 5%, BASED ON THE TIO2 EQUIVALENT OF SAID HYDROUS TITANIA, OF AN ESSENTIALLY NONIONIC POLYHYDRIC ALCOHOL, THEREBY SOLUBILIZING AT LEAST PART OF SAID IONS, AND THEREAFTER REMOVING SAID SOLUTION CONTAINING SAID SOLUBILIZED IONS.
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) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |