US4025667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enzyme carriers
Assignee: Corning Glass Works
•
Filing: 1973-07-30
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Granted: 1977-05-24
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Expires: 1993-07-30
Abstract
Abstract The half-life of enzymes which have been immobilized by chemical coupling via silane coupling agents to inorganic carriers is increased significantly by using a carrier which has been treated to increase its water-durability. Treatment of the carrier comprises the steps of first coating the carrier with a solution containing a metal, the oxide of which is more water-durable than the carrier, and then firing the coated carrier to form a continuous metal oxide layer on the carrier surface. The treated carriers are then silanized for chemical coupling wih enzymes. Methods for preparing and using enzyme composites having the improved carrier are disclosed.
Inventors
- 👤 William H. Tomb
- 👤 Howard H. Weetall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:46
CPC Classifications
C; C12; C12N; C12N11/00; C12N11/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A method of improving the water-durability of controlled pore porous glass particles which comprises the steps of: (a) contacting porous glass particles having a particle size of 40 to 80 mesh with a solution of a chelated zirconium compound; and (b) heating the particles to a temperature between about 200° C. and 800° C. to form a thin, continuous layer of an oxide of zirconium on the surfaces of the porous glass particles.
Claim 2
Independent Claim
73 words
A method of improving the water-durability of controlled pore porous glass particles which comprises the steps of: (a) contacting porous glass particles having a particle size of 40 to 80 mesh with a solution of a chelated zirconium compound; and (b) heating the particles to a temperature between about 200° C. and 800° C. to form a thin, continuous layer of an oxide of zirconium on the surfaces of the porous glass particles.
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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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |