Patent US3734831A successfully refreshed from Google Patents.
US3734831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of cellulase
Assignee: Canadian Patents and Development Ltd
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Filing: 1970-11-27
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Granted: 1973-05-22
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Expires: 1990-11-27
Abstract
Abstract IN A PROCESS FOR PRODUCING CELLULASE IN A SUBMERGED CULTURE CONTAINING A CELLULASE SYNTHESIZING FUNGUS AND NUTRIENTS INCLUDING AN ASSIMILABLE CARBON SOURCE MATERIAL, THE IMPROVEMENT COMPRISING REGULATING THE AMOUNT OF ASSIMILABLE CARBON SOURCE MATERIAL IN SAID CULTURE MEDIUM SO AS TO MAINTAIN ITS CONCENTRATION AT A STAGE OF IMMINENT EXHAUSTION SO AS TO MAXIMIZE CELLULASE PRODUCTION.
Inventors
- 👤 M Hulme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:00
CPC Classifications
C; C12; C12N; C12N9/00; C12N9/14; C12N9/24; C12N9/2402; C12N9/2405; C12N9/2434; C12N9/2437; C12Y; C12Y302/00; C12Y302/01; C12Y302/01004; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911; Y10S435/945
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |