US3036959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing poly-beta-hydroxy-butyric acid
Assignee: WR Grace and Co
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Filing: 1960-09-26
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Granted: 1962-05-29
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Expires: 1980-09-26
Abstract
No abstract record available.
Inventors
- 👤 Baptist James Noel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:38
CPC Classifications
C; 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
55 words
THE PROCESS OF PREPARING POLY-B-HYDROXYBUTYRIC ACID WHICH COMPRISES GROWING APPROPRIATE BACTERIA IN A CULTURE MEDIUM UNDER CONDITIONS CONDUCIVE TO THE FORMATION OF POLY-B-HYDROXYBUTYRIC ACID, ADDING THE BACTERIAL CELL MASS TO HOT PYRIDINE TO EXTRACT THE POLY-B-HYDROXYBUTYRIC ACID, SEPARATING THE PYRIDINE SOLUTION OF POLYESTER FROM THE CELL RESIDUE, AND RECOVERING THE POLYESTER PRODUCT FROM THE PYRIDINE.
Claim 2
Dependent Claim
55 words
THE PROCESS OF PREPARING POLY-B-HYDROXYBUTYRIC ACID WHICH COMPRISES GROWING APPROPRIATE BACTERIA IN A CULTURE MEDIUM UNDER CONDITIONS CONDUCIVE TO THE FORMATION OF POLY-B-HYDROXYBUTYRIC ACID, ADDING THE BACTERIAL CELL MASS TO HOT PYRIDINE TO EXTRACT THE POLY-B-HYDROXYBUTYRIC ACID, SEPARATING THE PYRIDINE SOLUTION OF POLYESTER FROM THE CELL RESIDUE, AND RECOVERING THE POLYESTER PRODUCT FROM THE PYRIDINE.
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) | 1965-05-28 | 1965-11-27 | 1966-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-28 | 1969-11-27 | 1970-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-28 | 1973-11-27 | 1974-05-29 | $7700.00 | Window Closed / Lapsed |