US3248382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of isolating acetylated polysaccharides
Assignee: FMC Corp
•
Filing: 1962-09-07
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Granted: 1966-04-26
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Expires: 1982-09-07
Abstract
No abstract record available.
Inventors
- 👤 Robert H Marchessault
- 👤 Patricia D Cafferty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:29
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0057
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A METHOD OF ISOLATING ACETYLATED POLYSACCHARIDES FROM SUBSTANTIALLY LIGNIN-FREE AND PARTIALLY DELIGNIFIED VEGETABLE MATERIAL WHICH COMPRISES TREATING SAID LIGNINFREE MATERIAL WITH LIQUID AMMONIA UNTIL IT BECOMES SWOLLEN, AND EXTRACTING WATER-SOLUBLE, ACETYLATED POLYSACCHARIDE FROM THE SWOLLEN MATERIAL WITH BUFFERED WATER AT A PH OF FROM 4 TO 6.
Claim 2
Independent Claim
47 words
A METHOD OF ISOLATING ACETYLATED POLYSACCHARIDES FROM SUBSTANTIALLY LIGNIN-FREE AND PARTIALLY DELIGNIFIED VEGETABLE MATERIAL WHICH COMPRISES TREATING SAID LIGNINFREE MATERIAL WITH LIQUID AMMONIA UNTIL IT BECOMES SWOLLEN, AND EXTRACTING WATER-SOLUBLE, ACETYLATED POLYSACCHARIDE FROM THE SWOLLEN MATERIAL WITH BUFFERED WATER AT A PH OF FROM 4 TO 6.
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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |