US3712867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of microcapsules with the aid of synthetic coacervates and microcapsules produced thereby
Assignee: Bayer AG
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Filing: 1971-02-17
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Granted: 1973-01-23
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Expires: 1991-02-17
Abstract
Abstract A PROCESS FOR THE PRODUCTION OF MICROCAPSULES WITH COACERVATES OF SYNTHETIC POLYMERS AS SHELL SUBSTANCES, WHEREIN THE SOLID OR LIQUID CORE MATERIAL TO BE ENCAPSULATED IS DISPERSED IN AN AQUOUS SOLUTION OF A THERMOREVERSIBLE COACERATIVE COPOLYMER OF 70 TO 30 MOL PERCENT OF THE ACRYLIC ACID AND 30 TO 70 MOL PERCENT OF ACRYLAMIDE AT A TEMPERATURE ABOVE THE COACERVATE TRANSITION TEMPERATURE, THE RESULTING DISPERSION IS COOLED TO BELOW THE COACERVATE TRANSITION TEMPERATURE, THE COACERVATE FORMED IS DEPOSITED ONTO THE DISPERSED PARTICLES, IS OPTIONALLY CHEMICALLY CROSSLINKED, AND THE MICROCAPSULES OBTAINED ARE SEPARATED OFF AND DRIED.
Inventors
- 👤 N Schon
- 👤 G Pampus
- 👤 H Schnoring
- 👤 J Witte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:36
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)
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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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |