Patent US3791977A successfully refreshed from Google Patents.
US4123382A
Expired / Lapsed
US
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Method of microencapsulation
Assignee: Merck and Co Inc
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Filing: 1973-05-25
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Granted: 1978-10-31
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Expires: 1993-05-25
Abstract
Abstract Solids are added to a suspension of heat softened ethylcellulose capsules and are then encapsulated within the soft capsule. Cooling permits recovery of the desired encapsulated product.
Inventors
- 👤 Lewis D. Morse
- 👤 William G. Walker
- 👤 Paul A. Hammes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:55
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/48; A61K9/50; B; B01; B01J; B01J13/00; B01J13/02; B01J13/20; B01J13/203; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987; Y10T428/2989
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
A process for producing microencapsulated solid products which comprises introducing said solid products in a finely divided state to soft blank microcapsules formed from an encapsulating material selected from the group consisting of ethylcellulose, methylcellulose, hydroxypropylmethylcellulose, polyvinyl alcohol, cellulose acetate phthallate, gelatin, gum arabic and carageenan alginates in a solvent medium, hardening said soft microcapsules after said solid products have entered said microcapsules, and recovering the microencapsulated product from the resultant mixture.
Claim 2
Dependent Claim
72 words
A process for producing microencapsulated solid products which comprises introducing said solid products in a finely divided state to soft blank microcapsules formed from an encapsulating material selected from the group consisting of ethylcellulose, methylcellulose, hydroxypropylmethylcellulose, polyvinyl alcohol, cellulose acetate phthallate, gelatin, gum arabic and carageenan alginates in a solvent medium, hardening said soft microcapsules after said solid products have entered said microcapsules, and recovering the microencapsulated product from the resultant mixture.
Claim 3
Dependent Claim
69 words
A process for producing ethylcellulose encapsulated product which comprises heating a dispersion of ethylcellulose in cyclohexane to effect a solution of said ethylcellulose, then cooling the resultant solution to obtain a dispersion of finely divided ethylcellulose capsules, adding a solid product to the soft ethylcellulose capsules at a temperature between 45° C. and 60° C. and agitating the resulting mix for sufficient time to envelope the added solid product.
Claim 4
Dependent Claim
69 words
A process for producing ethylcellulose encapsulated product which comprises heating a dispersion of ethylcellulose in cyclohexane to effect a solution of said ethylcellulose, then cooling the resultant solution to obtain a dispersion of finely divided ethylcellulose capsules, adding a solid product to the soft ethylcellulose capsules at a temperature between 45° C. and 60° C. and agitating the resulting mix for sufficient time to envelope the added solid product.
Claim 5
Dependent Claim
13 words
The process of claim 2 in which the solid product is a medicament.
Claim 6
Dependent Claim
13 words
The process of claim 2 in which the solid product is a vitamin.
Claim 7
Dependent Claim
11 words
The process of claim 4 in which the vitamin is riboflavin.
Claim 8
Dependent Claim
49 words
In the process of microencapsulation, the step which comprises adding the solid product to be microencapsulated to a suspension of heat softened blank microcapsules formed from an encapsulating material selected from the group consisting of ethylcellulose, methylcellulose, hydroxypropylmethylcellulose, polyvinyl alcohol, cellulose acetate phthallate, gelatin, gum arabic and carageenan alginates.
Claim 9
Dependent Claim
49 words
In the process of microencapsulation, the step which comprises adding the solid product to be microencapsulated to a suspension of heat softened blank microcapsules formed from an encapsulating material selected from the group consisting of ethylcellulose, methylcellulose, hydroxypropylmethylcellulose, polyvinyl alcohol, cellulose acetate phthallate, gelatin, gum arabic and carageenan alginates.
References Cited (Backward Citations)
US2911338A
Cited
US3415758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |