Patent US4634672A successfully refreshed from Google Patents.
US4634672A
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Immobilization of cells in polyurethane hydrogel
Assignee: Bayer AG
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Filing: 1985-08-12
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Granted: 1987-01-06
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Expires: 2005-08-12
Abstract
Abstract A biologically active composition is prepared comprising a polyurethane hydrogel containing surface active coal, a polymer having cationic groups and cells having enzymatic activity and being capable of growth. The composition is used for purifying waste water and outgoing air.
Inventors
- 👤 Jorg Baumgarten
- 👤 Werner Frommer
- 👤 Theo Mann
- 👤 Imre Pascik
- 👤 Hans-Georg Rast
- 👤 Dietmar Schapel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:15
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/10; C02F3/105; C02F3/108; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/84; C02F3/34; C02F3/342; C12; C12N; C12N11/00; C12N11/02; C12N11/04; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
43 words
A biologically active composition comprising a polyurethane hydrogel containing (i) surface active coal having a specific surface according to BET of above 50 m 2/ g, (ii) a polymer having cationic groups, and (iii) cells having enzymatic activity and being capable of growth.
Claim 2
Dependent Claim
43 words
A biologically active composition comprising a polyurethane hydrogel containing (i) surface active coal having a specific surface according to BET of above 50 m 2/ g, (ii) a polymer having cationic groups, and (iii) cells having enzymatic activity and being capable of growth.
Claim 3
Dependent Claim
14 words
The composition of claim 1 wherein said polymer (ii) is an ion exchange resin.
Claim 4
Dependent Claim
17 words
The composition of claim 1 wherein said polymer (ii) is a polymer which contains positively-charged nitrogen atoms.
Claim 5
Dependent Claim
19 words
The composition of claim 1 wherein said cells (iii) occur in the digested and activated sludge of clarification plants.
Claim 6
Dependent Claim
17 words
The composition of claim 1 wherein said cells (iii) are adapted for the metabolization of specific substances.
Claim 7
Dependent Claim
42 words
The composition of claim 1 wherein said hydrogel is prepared from a toluene diisocyanate prepolymer having an isocyanate group content of from 1.5 to 4% by weight and having a free toluene diisocyanate content of less than 1% by weight, and water.
Claim 8
Dependent Claim
52 words
The composition of claim 1 wherein said coal (i) is present in an amount of from 0.5 to 40% by weight, said polymer (ii) is present in an amount of from 0.2 to 20% by weight, and said cells (iii) are present in an amount of from 0.3 to 15% by weight.
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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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |