Patent US3558507A successfully refreshed from Google Patents.
US3558507A
Expired / Lapsed
US
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Method of forming miniature capsules
Assignee: Gunther Wagner Pelikan Werke GmbH
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Filing: 1967-04-04
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Granted: 1971-01-26
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Expires: 1987-04-04
Abstract
Abstract THE INVENTION IS CONCERNED WITH THE FORMATION OF VERY TINY OR MINIATURES CAPSULES WHICH ENVELOPE LIQUID SUBSTANCES THAT MAY CONTAIN SOLIDS SUCH AS, FOR EXAMPLE, SOOT OR PIGMENTS. IN ACCORDANCE WITH THE INVENTION, THE CAPSULES ARE FORMED FROM A DISPERSION SYSTEM WHICH CONTAINS A CELLULOSE ESTER SUCH AS, FOR EXAMPLE, CELLULOSE ACETOBUTYRATE, THE LIQUID SUBSTANCE TO BE ENCAPSULATED, A MEDIUM, TO WIT, WATER, AND AN ALKALINE SUBSTANCE WHICH REACTS BY SAPONIFICATION WITH THE CELLULOSE ESTER TO FORM A FILM WHICH IS INSOLUBLE IN THE WATER AND IN THE LIQUID MATERIAL TO BE ENCAPSULATED.
Inventors
- 👤 Ludwig Harbort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:16
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |