Patent US2694058A successfully refreshed from Google Patents.
US2694058A
Expired / Lapsed
US
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Production of polyuronic acid derivatives
Assignee: F Hoffmann La Roche AG
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Filing: 1951-10-20
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Granted: 1954-11-09
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Expires: 1971-10-20
Abstract
No abstract record available.
Inventors
- 👤 Berger Leo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:29
CPC Classifications
C; C07; C07H; C07H7/00; C07H7/02; C07H7/033
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS OF PRODUCING A POLYMANNURONIC ACID METHYLGLYCOSIDE METHYL ESTER FRACTION WHICH COMPRISES PARTIALLY DEGRADING A MEMBER OF THE CLASS CONSISTING OF ALGINIC ACID AND THE SALTS THEREOF WITH METHANOL-HYDROGEN CHLORIDE TO FROM A POLYMANNURONIC ACID METHYLGLYCOSIDE METHYL ESTER PRODUCT WHICH IS ONLY PARTIALLY SOLUBLE IN WATER AT ABOUT 20-30* C. SUSPENDING THE PRODUCT IN WATER AT THE AFORESAID TEMPERATURE, REMOVING THE INSOLUBLE PORTION FROM THE AQEOUS SUSPENSION, DIALYZING THE RESULTING SOLUTION TO CONSTANT WEIGHT OF THE POLYMANNURONIC ACID METHYLGLYCOSIDE METHYL ESTER PRODUCT PRESENT THEREIN AND SUBSTANTIALLY FULLY SULFATING THE DIALYZED POLYMANNURONIC ACID METHYGLYCOSIE METHYL ESTER.
Claim 2
Dependent Claim
96 words
A PROCESS OF PRODUCING A POLYMANNURONIC ACID METHYLGLYCOSIDE METHYL ESTER FRACTION WHICH COMPRISES PARTIALLY DEGRADING A MEMBER OF THE CLASS CONSISTING OF ALGINIC ACID AND THE SALTS THEREOF WITH METHANOL-HYDROGEN CHLORIDE TO FROM A POLYMANNURONIC ACID METHYLGLYCOSIDE METHYL ESTER PRODUCT WHICH IS ONLY PARTIALLY SOLUBLE IN WATER AT ABOUT 20-30* C. SUSPENDING THE PRODUCT IN WATER AT THE AFORESAID TEMPERATURE, REMOVING THE INSOLUBLE PORTION FROM THE AQEOUS SUSPENSION, DIALYZING THE RESULTING SOLUTION TO CONSTANT WEIGHT OF THE POLYMANNURONIC ACID METHYLGLYCOSIDE METHYL ESTER PRODUCT PRESENT THEREIN AND SUBSTANTIALLY FULLY SULFATING THE DIALYZED POLYMANNURONIC ACID METHYGLYCOSIE METHYL ESTER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-08 | 1958-05-10 | 1958-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-08 | 1962-05-10 | 1962-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-08 | 1966-05-10 | 1966-11-09 | $7700.00 | Window Closed / Lapsed |