Patent US4551482A successfully refreshed from Google Patents.
US4551482A
Expired / Lapsed
US
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Macroporous, hydrophilic enzyme carrier
Assignee: BASF SE
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Filing: 1983-06-23
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Granted: 1985-11-05
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Expires: 2003-06-23
Abstract
Abstract A macroporous, hydrophilic enzyme carrier comprises a sulfonated polymer, charged with polyethyleneimine, of from 10 to 100% by weight of divinylbenzene, from 0 to 90% by weight of styrene and from 0 to 20% by weight of a copolymerizable monomer, the polyethyleneimine being neither crosslinked nor covalently bonded to the polymer.
Inventors
- 👤 Chung-Ji Tschang
- 👤 Stefan Marcinowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:15
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/36; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/42; C12; C12N; C12N11/00; C12N11/02; C12N11/08; C12N11/082; C12N11/089; C08F2800/00; C08F2800/20; C08J2479/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
36 words
A macroporous, hydrophilic enzyme carrier in bead form which comprises a polymer charged with polyethyleneimine, said polymer being sulfonated after its formation and containing sulfo groups polyethyleneimine being neither crosslinked nor covalently bonded to the polymer.
Claim 2
Dependent Claim
36 words
A macroporous, hydrophilic enzyme carrier in bead form which comprises a polymer charged with polyethyleneimine, said polymer being sulfonated after its formation and containing sulfo groups polyethyleneimine being neither crosslinked nor covalently bonded to the polymer.
Claim 3
Dependent Claim
67 words
A carrier as claimed in claim 1, wherein the sulfo-containing polymer is a polymer, sulfonated after polymerization, of the following monomers: (a) from 10 to 100% by weight of divinylbenzene, (b) from 0 to 90% by weight of styrene, which may be mono-or polysubstituted by C 1 -C 4 -alkyl, and (c) from 0 to 20% by weight of monomers which are copolymerizable with styrene and divinylbenzene.
Claim 4
Dependent Claim
32 words
A carrier as claimed in claim 1, which has a pore volume of from 0.8 to 4 cm 3 /g and a pore diameter of from 2.5×10 -5 to 2×10 -3 mm.
Claim 5
Dependent Claim
32 words
A carrier as claimed in claim 2, which has a pore volume of from 0.8 to 4 cm 3 /g and a pore diameter of from 2.5×10 -5 to 2×10 -3 mm.
Claim 6
Dependent Claim
20 words
A carrier as claimed in claim 1, wherein the polyethyleneimine used has a molecular weight of from 1,000 to 5,000.
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) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |