US3069370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coacervation process for encapsulation of lipophilic materials
Assignee: Pharmacia and Upjohn Co
•
Filing: 1958-12-22
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Granted: 1962-12-18
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Expires: 1978-12-22
Abstract
No abstract record available.
Inventors
- 👤 Erik H Jensen
- 👤 John G Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:18
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/48; A61K9/50; A61K9/5089; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/08; Y; Y10; Y10S; Y10S260/00; Y10S260/22; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987; Y10T428/2989
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A PROCESS FOR THE ENCAPSULATION OF FINELY DIVIDED LIPOPHILIC MATERIAL WHEREIN THE CAPSULE MANTLE CONSISTS ESSENTIALLY OF A POLYMER, WHICH PROCESS INCLUDES THE STEPS OF (1) PREPARING A DISPERSION OF LIPOPHILIC MATERIAL SELECTED FORM THE GROUP CONSISTING OF FATS, OILS, WAXES AND WAX-LIKE SOLIDS IN AN AQUEOUS LIQUID SOLUTION OF A STYRENE MALEIC ANHYDRIC COPOLYMER, THE ANHYDRIDE GROUPS OF WHICH ARE AT LEAST 50% HYDROLYZED, (2) ADDING INSOLUBILIZING SALT UNTIL A VISIBLE CLOUDING IS OBSERVED. (3) ADJUSTING THE PH OF THE MIXTURE UNTIL AN OPACITY IN THE MANTLE IS OBSERVED, AND (4) SEPARATING THE THUS-PRODUCED CAPSULES FROM THE AQUEOUS LIQUID.
Claim 2
Dependent Claim
100 words
A PROCESS FOR THE ENCAPSULATION OF FINELY DIVIDED LIPOPHILIC MATERIAL WHEREIN THE CAPSULE MANTLE CONSISTS ESSENTIALLY OF A POLYMER, WHICH PROCESS INCLUDES THE STEPS OF (1) PREPARING A DISPERSION OF LIPOPHILIC MATERIAL SELECTED FORM THE GROUP CONSISTING OF FATS, OILS, WAXES AND WAX-LIKE SOLIDS IN AN AQUEOUS LIQUID SOLUTION OF A STYRENE MALEIC ANHYDRIC COPOLYMER, THE ANHYDRIDE GROUPS OF WHICH ARE AT LEAST 50% HYDROLYZED, (2) ADDING INSOLUBILIZING SALT UNTIL A VISIBLE CLOUDING IS OBSERVED. (3) ADJUSTING THE PH OF THE MIXTURE UNTIL AN OPACITY IN THE MANTLE IS OBSERVED, AND (4) SEPARATING THE THUS-PRODUCED CAPSULES FROM THE AQUEOUS LIQUID.
References Cited (Backward Citations)
US2006002A
Cited
US2698794A
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US2800457A
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US2800458A
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US2897121A
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US2969331A
Cited
US2969330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |