Patent US3819250A successfully refreshed from Google Patents.
US3044942A
Expired / Lapsed
US
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Process for preparing poly-beta-hydroxybutyric acid
Assignee: WR Grace and Co
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Filing: 1960-09-27
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Granted: 1962-07-17
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Expires: 1980-09-27
Abstract
No abstract record available.
Inventors
- 👤 Baptist James Noel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:15
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C12; C12P; C12P7/00; C12P7/62; C12P7/625; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/832; Y10S435/837
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
THE PROCESS OF PREPARING POLY-B-HYDROXYBUTYRIC ACID WHICH COMPRISES GROWING APPROPRIATE BACTERIAL IN A CULTURE MEDIUM UNDER CONDITIONS CONDUCTIVE TO THE FORMATION OF POLY-B-HYDROXYBUTYRIC ACID, ADDING THE BACTERIAL CELL MASS TO METHYLENE CHLORIDE/ETHANOL SOLUTION TO EXTRACT THE POLY-B-HYDROXYBUTYRIC ACID, SEPARATING THE METHYLENE CHLORIDE/ETHANOL-POLYESTER FROM THE CELL RESIDUE, AND RECOVERING THE POLYESTER PRODUCT FROM SOLUTION.
Claim 2
Dependent Claim
53 words
THE PROCESS OF PREPARING POLY-B-HYDROXYBUTYRIC ACID WHICH COMPRISES GROWING APPROPRIATE BACTERIAL IN A CULTURE MEDIUM UNDER CONDITIONS CONDUCTIVE TO THE FORMATION OF POLY-B-HYDROXYBUTYRIC ACID, ADDING THE BACTERIAL CELL MASS TO METHYLENE CHLORIDE/ETHANOL SOLUTION TO EXTRACT THE POLY-B-HYDROXYBUTYRIC ACID, SEPARATING THE METHYLENE CHLORIDE/ETHANOL-POLYESTER FROM THE CELL RESIDUE, AND RECOVERING THE POLYESTER PRODUCT FROM SOLUTION.
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) | 1965-07-16 | 1966-01-15 | 1966-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-16 | 1970-01-15 | 1970-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-16 | 1974-01-15 | 1974-07-17 | $7700.00 | Window Closed / Lapsed |