Patent US2819176A successfully refreshed from Google Patents.
US2819176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized colloidal titania monohydrate suspensions
Assignee: Wyeth Holdings LLC
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Filing: 1954-02-11
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Granted: 1958-01-07
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Expires: 1974-02-11
Abstract
No abstract record available.
Inventors
- 👤 Richard D Vartanian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:59
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/32; D06M11/36; D06M11/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS WHICH COMPRISES ACIDIFYING A SUBSTANTIALLY SULFATE ION FREE AQUEOUS SUSPENSION OF TITANIA MONOHYDRATE TO A PH BELOW ABOUT 5 WITH A MONOBASIC INORGANIC ACID AND THEREAFTER REVERSING THE CHARGE ON THE RESULTING COLLOIDAL PARTICLES BY CHANGING THE PH TO A VALUE BETWEEN ABOUT 5 AND ABOUT 11 WITH AN ALKALIZING AGENT CONTAINING AMMONIA AND A SECOND ACID OF THE GROUP CONSISTING OF WATER-SOLUBLE ALIPHATIC ACIDS AND WATER-SOLUBLE POLYBASIC INORGANIC ACIDS, THE AMMONIA BEING EMPLOYED IN STOICHIOMETRIC EXCESS RELATIVE TO THE SECOND ACID AND BEING INTRODUCED INTO THE INITIAL TITANIA HYDRATE SUSPENSION NO EARLIER THAN SAID SECOND ACID, TO PRODUCE A STABLE COLLOIDAL SUSPENSION OF NEGATIVELY CHARGED SUBSTANTIALLY UNIFORM TITANIA MONOHYDRATE PARTICLES LESS THAN ABOUT 0.1 MICRON IN SIZE.
Claim 2
Dependent Claim
120 words
A PROCESS WHICH COMPRISES ACIDIFYING A SUBSTANTIALLY SULFATE ION FREE AQUEOUS SUSPENSION OF TITANIA MONOHYDRATE TO A PH BELOW ABOUT 5 WITH A MONOBASIC INORGANIC ACID AND THEREAFTER REVERSING THE CHARGE ON THE RESULTING COLLOIDAL PARTICLES BY CHANGING THE PH TO A VALUE BETWEEN ABOUT 5 AND ABOUT 11 WITH AN ALKALIZING AGENT CONTAINING AMMONIA AND A SECOND ACID OF THE GROUP CONSISTING OF WATER-SOLUBLE ALIPHATIC ACIDS AND WATER-SOLUBLE POLYBASIC INORGANIC ACIDS, THE AMMONIA BEING EMPLOYED IN STOICHIOMETRIC EXCESS RELATIVE TO THE SECOND ACID AND BEING INTRODUCED INTO THE INITIAL TITANIA HYDRATE SUSPENSION NO EARLIER THAN SAID SECOND ACID, TO PRODUCE A STABLE COLLOIDAL SUSPENSION OF NEGATIVELY CHARGED SUBSTANTIALLY UNIFORM TITANIA MONOHYDRATE PARTICLES LESS THAN ABOUT 0.1 MICRON IN SIZE.
References Cited (Backward Citations)
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Cited
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US2028575A
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US2357101A
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US2448683A
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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) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |