US3929574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of enzymes bound to polyurethane
Assignee: WR Grace and Co
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Filing: 1975-03-21
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Granted: 1975-12-30
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Expires: 1995-03-21
Abstract
Abstract To chemically bind either impure or purified enzymes to polyurethane to produce insolubilized bound enzymes which are still enzymically active and which may be more stable than the original enzyme, and which can be reused without appreciable activity loss and whose physical characteristics can be varied depending on the application for which they are intended.
Inventors
- 👤 Louis L Wood
- 👤 Frank J Hartdegen
- 👤 Peter A Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:27
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; A; A01; A01C; A01C1/00; A01C1/04; A01C1/044; A01C1/046; B; B29; B29C; B29C44/00; B29C44/20; B29C44/32; B29C44/326; B29C44/34; B29C44/56; B29C44/5627; B29C44/5654; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; A01G; A01G24/00; A01G24/40; A01G24/48; C08G2110/00; C08G2110/0083; C08G2310/00; C08J2375/00; C08J2375/04; C08J2375/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
THE METHOD OF TREATING A MATERIAL WITH AN ENZYME WHICH INCLUDES THE STEP OF CONTACTING AN AQUEOUS DISPERSION OR SOLUTION OF THE MATERIAL WITH A FOAMED POLYURETHANE CONTAINING AN ENZYME INTEGRALLY BOUND THERETO PREPARTED BY THE METHOD WHICH INCLUDES CONTACTING, PRIOR TO A SUBSEQUENT FOAMING STEP, AN ISOCYANATE-CAPTPED POLYURETHANE WITH AN AQUEOUS DISPERSION OF AN EZNYME, UNDER FOAM-FORMING CONDITIONS, WHEREBY THE POLYURETHANE FOAMS AND THE ENZYME BECOMES INTEGRALLY BOUND TO THE THUS FORMED POLYURETHANE FOAM.
Claim 2
Independent Claim
75 words
THE METHOD OF TREATING A MATERIAL WITH AN ENZYME WHICH INCLUDES THE STEP OF CONTACTING AN AQUEOUS DISPERSION OR SOLUTION OF THE MATERIAL WITH A FOAMED POLYURETHANE CONTAINING AN ENZYME INTEGRALLY BOUND THERETO PREPARTED BY THE METHOD WHICH INCLUDES CONTACTING, PRIOR TO A SUBSEQUENT FOAMING STEP, AN ISOCYANATE-CAPTPED POLYURETHANE WITH AN AQUEOUS DISPERSION OF AN EZNYME, UNDER FOAM-FORMING CONDITIONS, WHEREBY THE POLYURETHANE FOAMS AND THE ENZYME BECOMES INTEGRALLY BOUND TO THE THUS FORMED POLYURETHANE FOAM.
Claim 3
Dependent Claim
31 words
The method according to claim 1 of hydrolyzing urea to ammonia and carbon dioxide which includes contacting an aqueous solution of urea with a foamed polyurethane containing urease integrally bound thereto.
Claim 4
Dependent Claim
31 words
The method according to claim 1 of hydrolyzing starch to sugars which includes the step of contacting an aqueous dispersion of starch with a foamed polyurethane containing amylglucosidase integrally bound thereto.
Claim 5
Dependent Claim
32 words
The method according to claim 1 of converting glucose to fructose which includes the step of contacting an aqueous solution of glucose with a foamed polyurethane containing glucose isomerase integrally bound thereto.
Claim 6
Dependent Claim
32 words
The method according to claim 1 of converting lactose to glucose which includes the step of contacting an aqueous solution of lactase with a foamed polyurethane containing lactose enzyme integrally bound thereto.
Claim 7
Dependent Claim
35 words
The method according to claim 1 of converting penicillin G. to 6-aminopenicillanic acid which includes the step of contacting an aqueous solution of penicillin G with a foamed polyurethane containing penicillin amidase integrally bound thereto.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |