Patent US3250790A successfully refreshed from Google Patents.
US3250790A
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6-o-higher alkenoyl-ascorbic acid esters and their preparation
Assignee: F Hoffmann La Roche AG
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Filing: 1963-11-12
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Granted: 1966-05-10
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Expires: 1983-11-12
Abstract
No abstract record available.
Inventors
- 👤 Klaui Heinrich
- 👤 Schaeren Sidney Frank
- 👤 Schlegel Wolfgang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:55
CPC Classifications
C; C09; C09K; C09K15/00; C09K15/04; C09K15/06; A; A23; A23B; A23B2/00; A23B2/70; A23B2/725; A23B2/729; A23B2/742; A23B2/754; A23K; A23K30/00; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/62; C11; C11B; C11B5/00; C11B5/0021; C11B5/0028; C11C; C11C3/00; C11C3/003; Y; Y02; Y02A; Y02A40/00; Y02A40/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A PROCESS FOR THE PREPARATION OF AN ESTER OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ASCORBIC ACID AND ISOASCORBIC ACID ESTERIFIED IN THE 6-POSITION WITH A HIGHER OLEFINICALLY UNSATURATED FATTY ACID COMPRISING THE STEPS OF (A) REACTING A COMPOUND SELECTED FROM THE GROUP COMSISTING OF ASCROBIC ACID AND ISOACORBIC ACID WITH A HIGHER OLEFINICALLY UNSATURATED FATTY ACID IN THE PRESENCE OF BORON TRIFLUORIDE TO FORM AN ESTER-BORON TRIFLUORIDE COMPLEX, AND (B) DECOMPOSING SAID COMPLEX.
Claim 2
Dependent Claim
76 words
A PROCESS FOR THE PREPARATION OF AN ESTER OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ASCORBIC ACID AND ISOASCORBIC ACID ESTERIFIED IN THE 6-POSITION WITH A HIGHER OLEFINICALLY UNSATURATED FATTY ACID COMPRISING THE STEPS OF (A) REACTING A COMPOUND SELECTED FROM THE GROUP COMSISTING OF ASCROBIC ACID AND ISOACORBIC ACID WITH A HIGHER OLEFINICALLY UNSATURATED FATTY ACID IN THE PRESENCE OF BORON TRIFLUORIDE TO FORM AN ESTER-BORON TRIFLUORIDE COMPLEX, AND (B) DECOMPOSING SAID COMPLEX.
References Cited (Backward Citations)
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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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |