US4898781A
Expired / Lapsed
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Water-soluble microcapsules
Assignee: Novozymes AS
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Filing: 1987-11-09
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Granted: 1990-02-06
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Expires: 2007-11-09
Abstract
Abstract Water-soluble microcapsules using a water-containing hydrophilic substance as a core material and at least one member selected from the group consisting of polyvinyl alcohol and modified polyvinyl alcohols as a coating material are stably retained in a concentrated aqeuous solution and are dissolved in water or a dilute aqueous solution.
Inventors
- 👤 Takashi Onouchi
- 👤 Hironori Sugai
- 👤 Kazuo Sekiguchi
- 👤 Yoshikazu Hosoda
- 👤 Eiichi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:42
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/02; A61K8/11; A61K8/18; A61K8/30; A61K8/64; A61K8/66; A61K9/00; A61K9/14; A61K9/16; A61K9/1605; A61K9/1629; A61K9/1635; A61K9/48; A61K9/50; A61K9/5005; A61K9/5021; A61K9/5026; A61Q; A61Q5/00; A61Q5/02; B; B01; B01J; B01J13/00; B01J13/02; B01J13/04; B01J13/06; B01J13/12; B01J13/125; B01J13/14; B01J13/16; C; C11; C11D; C11D17/00; C11D17/0039; C11D3/00; C11D3/16; C11D3/38; C11D3/386; C11D3/38672; A61K2800/00; A61K2800/40; A61K2800/41; A61K2800/412; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
83 words
Water-soluble microcapsules comprising: a core material of hydrophilic substance which comprises an enzyme and a water-containing polyhydroxy compound in an amount of 2 to 50 times that of said enzyme by weight and having a water content of 5 to 40% by weight, said enzyme being dissolved or dispersed in said water-containing polyhydroxy compound; and a coating material of polyvinyl alcohol having an average degree of polymerization in the range of 200 to 3,000 and a saponification ratio of not less than 90%.
Claim 2
Dependent Claim
83 words
Water-soluble microcapsules comprising: a core material of hydrophilic substance which comprises an enzyme and a water-containing polyhydroxy compound in an amount of 2 to 50 times that of said enzyme by weight and having a water content of 5 to 40% by weight, said enzyme being dissolved or dispersed in said water-containing polyhydroxy compound; and a coating material of polyvinyl alcohol having an average degree of polymerization in the range of 200 to 3,000 and a saponification ratio of not less than 90%.
Claim 3
Dependent Claim
18 words
The water-soluble microcapsules according to claim 1, wherein said polyvinyl alcohol has been treated with a cross-linking agent.
Claim 4
Dependent Claim
41 words
The water-soluble microcapsules according to claim 1, wherein said polyhydroxy compound is at least one member selected from the group consisting of compounds possessing 2 to 6 carbon atoms and containing two or more hydroxyl groups and polymers of said compounds.
References Cited (Backward Citations)
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CH517123A
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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) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |