Patent US3281331A successfully refreshed from Google Patents.
US3281331A
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Process of isolating and separating proteolytic enzymes
Assignee: AstraZeneca AB
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Filing: 1962-10-19
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Granted: 1966-10-25
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Expires: 1982-10-19
Abstract
No abstract record available.
Inventors
- 👤 Bergkvist Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:42
CPC Classifications
C; C12; C12N; C12N9/00; C12N9/14; C12N9/48; C12N9/50; C12N9/58; C12N9/62; Y; Y10; Y10S; Y10S424/00; Y10S424/13; Y10S435/00; Y10S435/814; Y10S435/815; Y10S435/8215; Y10S435/911; Y10S435/913; Y10S435/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS OF SELECTIVELY ISOLATING AND SEPARATING PROTEOLYTIC ENZYMES, SAID PROCESS COMPRISING THE STEPS OF (A) CONTRACTING A SOLUTION OF THE PROTEASES WITH AN ION EXCHANGE AGENT SELECTED FROM THE GROUP CONSISTING OF CARBOXYL METHYL CELLULOSE AND A CARBOXY MRTHYL CROSS-LINKED DEXTRAN AT A PH BETWEEN ABOUT 2.5 AND ABOUT 8.5 AND (B) CHANGE AGENT BY PASSING THERETHOUGH AN ELUTING ELUTING THE ADSORBED POTEASES FROM SAID ION EXSOLUTION BUFFERES TO A PH-VALUE HIGHER THAN THAT AT WHICH THE RESPECTIVE POTEASES WERE ADSORBED.
Claim 2
Dependent Claim
82 words
A PROCESS OF SELECTIVELY ISOLATING AND SEPARATING PROTEOLYTIC ENZYMES, SAID PROCESS COMPRISING THE STEPS OF (A) CONTRACTING A SOLUTION OF THE PROTEASES WITH AN ION EXCHANGE AGENT SELECTED FROM THE GROUP CONSISTING OF CARBOXYL METHYL CELLULOSE AND A CARBOXY MRTHYL CROSS-LINKED DEXTRAN AT A PH BETWEEN ABOUT 2.5 AND ABOUT 8.5 AND (B) CHANGE AGENT BY PASSING THERETHOUGH AN ELUTING ELUTING THE ADSORBED POTEASES FROM SAID ION EXSOLUTION BUFFERES TO A PH-VALUE HIGHER THAN THAT AT WHICH THE RESPECTIVE POTEASES WERE ADSORBED.
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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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |