US3703576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing micro-capsules enclosing acetylsalicylic acid therein
Assignee: Fujifilm Holdings Corp
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Filing: 1970-08-10
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Granted: 1972-11-21
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Expires: 1990-08-10
Abstract
Abstract A METHOD FOR ENCAPSULATING ACETYLSALICYLIC ACID WHICH COMPRISES DISPERSING ACETYLSACLICYLIC ACID IN AN ORGANIC SOLVENT SOLUTION OF A CELLULOSE DERIVATIVE, DISPERSING THE RESULTING DISPERSION IN THE FORM OF DROPLETS IN A CONCENTRATED AQUEOUS SOLUTION OF AN INORGANIC SALT AND EVAPORATING THE ORGANIC SOLVENT FROM THE SYSTEM, IS DISCLOSED.
Inventors
- 👤 Masao Kitajima
- 👤 Yoozi Tsuneoka
- 👤 Asaji Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:16
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/08; A; A61; A61K; A61K9/00; A61K9/48; A61K9/50; A61K9/5089; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2989
Claims Analysis
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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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |