US3592739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of lactase
Assignee: Bayer Corp
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Filing: 1968-12-19
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Granted: 1971-07-13
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Expires: 1988-12-19
Abstract
Abstract LACTASE CAN BE ISOLATED AND SEPARTAED FROM IMPURITIES BY MIXING A LACTASE-CONTAINING SOLUTION WITH A HETEROPOLY ACID TO FORM A PRECIPITATE WITH THE LCATASE. THE RESULTING PRECIPITATE IS THEN SEPARATED FROM THE REMINAING SOLUTION. USEFUL HETEROPOLY ACIDS ARE PHOSPHOTUNGSTIC ACID, ARSENOTUNGSTIC ACID, SILICOTUNGSTIC ACID, BOROTUNGSTIC ACID, PHOSPHOMOLYBDIC ACID, ARSENOMOLYBDIC ACID, SILICOMOLYBDIC ACID, BOROMOLYBDIC ACID, PHOSPHOVANADIC ACID, ARSENOVANADIC ACID, SILICOVANADIC ACID, BOROVANADIC ACID AND MIXTURES AND COMBINATIONS THEREOF.
Inventors
- 👤 Moshe Sternberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:59
CPC Classifications
C; C12; C12Y; C12Y302/00; C12Y302/01; C12Y302/01023; C12N; C12N9/00; C12N9/14; C12N9/78; C12N9/86; C12N9/24; C12N9/2402; C12N9/2468; C12N9/2471; C12Y305/00; C12Y305/02; C12Y305/02006; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/832; Y10S435/837; Y10S435/885; Y10S435/911; Y10S435/913; Y10S435/914; Y10S435/918; Y10S435/94
Claims Analysis
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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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |