Patent US2814078A successfully refreshed from Google Patents.
US3743604A
Expired / Lapsed
US
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Process for the production of microcapsules
Assignee: Bayer AG
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Filing: 1971-08-23
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Granted: 1973-07-03
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Expires: 1991-08-23
Abstract
Abstract METHOD FOR PRODUCING MICROCAPSULES WHEREIN A SOLUTION OF A WATER-SOLUBLE POLYMER CONTAINING ACID AND BASE GROUPS AND A SOLUBLE OF A WATER-SOLUBLE POLYMER CONTAINING CARBOXYL- OR CARBOXYLATE GROUPS ARE PURIFIED BY MEANS OF AN ION-EXCHANGER AND WHEREIN A MATERIAL WHICH FORMS THE CORE OF THE MICROCAPSULES IS DISPERSED IN ONE OF SAID SOLUTIONS PRIOR TO MIXING THE SOLUTION. UPON MIXING THE SOLUTIONS, SPONTANEOUS CONCENTRATION OCCURS WITHOUT THE NECESSITY OF LOWERING THE TEMPERATURE. THE WATER-SOLUBLE POLYMERS USED ARE GELATIN AND GUM ARABIC.
Inventors
- 👤 H Schnoring
- 👤 N Schoen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:49
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987; Y10T428/2989
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |