US3149073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of dispersions containing hydrous aluminum oxide
Assignee: Wyeth Holdings LLC
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Filing: 1962-02-14
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Granted: 1964-09-15
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Expires: 1982-02-14
Abstract
No abstract record available.
Inventors
- 👤 Nemes Joseph John
- 👤 Munro Wendell Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:51
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/32; D06M11/36; D06M11/45; D06M2101/00; D06M2101/02; D06M2101/04; D06M2101/06; D06M2101/08; D06M2101/10; D06M2101/12; D06M2101/16; D06M2101/18; D06M2101/26; D06M2101/30; D06M2101/32; D06M2101/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN A PROCESS FOR PREPARING A THIXOTROPIC AQUEOUS DISPERSION CONTAINING HYDROUS ALUMINUM OXIDE WHICH IS STABLE AND FREE OF CRYSTAL FORMATION AFTER LOW TEMPERATURE STORAGE AND WHICH COMPRISES ADDING A WATER-SOLUBLE ALUMINUM SALT TO AN AQUEOUS SOLUTION OF ALKALI METAL BASE UNTIL A PH OF BETWEEN ABOUT 3 AND 5 IS OBTAINED, ADJUSTING THE PH OF THE DISPERSION TOBETWEEN ABOUT 6 AND 9 WITH AMMONIUM HYDROXIDE, DISPERSING THE PRECIPIATE BY MEANS OF A WATER-SOLUBLE PHOSPHATE DISPERSING AGENT, AND HAVING A MAJOR PORTION OF PARTICLES WHICH ARE 1.0 MICRON AND LESS IN DIAMETER, THE IMPROVEMENT WHICH COMPRISES ADDING A WATER SOLUBLE CALCIUM SALT SELECTED FROM THE GROUP CONSISTING OF CALCIUM CHLORIDE, CALCIUM NITRATE, CALCIUM FORMATE AND CALCIUM ACETATE TO THE MILLED DISPERSION.
Claim 2
Dependent Claim
121 words
IN A PROCESS FOR PREPARING A THIXOTROPIC AQUEOUS DISPERSION CONTAINING HYDROUS ALUMINUM OXIDE WHICH IS STABLE AND FREE OF CRYSTAL FORMATION AFTER LOW TEMPERATURE STORAGE AND WHICH COMPRISES ADDING A WATER-SOLUBLE ALUMINUM SALT TO AN AQUEOUS SOLUTION OF ALKALI METAL BASE UNTIL A PH OF BETWEEN ABOUT 3 AND 5 IS OBTAINED, ADJUSTING THE PH OF THE DISPERSION TOBETWEEN ABOUT 6 AND 9 WITH AMMONIUM HYDROXIDE, DISPERSING THE PRECIPIATE BY MEANS OF A WATER-SOLUBLE PHOSPHATE DISPERSING AGENT, AND HAVING A MAJOR PORTION OF PARTICLES WHICH ARE 1.0 MICRON AND LESS IN DIAMETER, THE IMPROVEMENT WHICH COMPRISES ADDING A WATER SOLUBLE CALCIUM SALT SELECTED FROM THE GROUP CONSISTING OF CALCIUM CHLORIDE, CALCIUM NITRATE, CALCIUM FORMATE AND CALCIUM ACETATE TO THE MILLED DISPERSION.
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) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |