Patent US3458808A successfully refreshed from Google Patents.
US2860130A
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US
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Methyl alginate
Assignee: Kelco Co
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Filing: 1954-11-01
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Granted: 1958-11-11
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Expires: 1974-11-01
Abstract
No abstract record available.
Inventors
- 👤 William H Mcneely
- 👤 John J O'connell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:52
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/006; C08B37/0084
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
57 words
A METHOD OF PRODUCING METHYL ALGINATE COMPRISING REACTING A WATER-SOLUBLE SALT OF ALGINIC ACID WITH DIMETHYL SULPHATE IN THE PRESENCE OF A NON-AQUEOUS LIQUID REACTION MEDIUM WHICH IS ONLY SLIGHTLY MISCIBLE WITH WATER, SUCH REACTION BEING CARRIED OUT AT A RELATIVELY LOW TEMPERATURE AND IN THE PRESENCE OF A BUFFERING AGENT AND A SMALL AMOUNT OF WATER.
Claim 2
Independent Claim
57 words
A METHOD OF PRODUCING METHYL ALGINATE COMPRISING REACTING A WATER-SOLUBLE SALT OF ALGINIC ACID WITH DIMETHYL SULPHATE IN THE PRESENCE OF A NON-AQUEOUS LIQUID REACTION MEDIUM WHICH IS ONLY SLIGHTLY MISCIBLE WITH WATER, SUCH REACTION BEING CARRIED OUT AT A RELATIVELY LOW TEMPERATURE AND IN THE PRESENCE OF A BUFFERING AGENT AND A SMALL AMOUNT OF WATER.
Claim 3
Dependent Claim
34 words
METHYL ALGINATE HAVING NOT LESS THAN ABOUT 35% OF THE CARBOXYL GROUPS METHYLATED, SAID METHY ALGINATE BEING SUBSTANTIALLY IN AN UNDEGRADED STATE, AND THE REMAINING CARBOXYL GROUPS BEING PRESENT SUBSTANTIALLY AS WATER-SOLUBLE SALT GROUPS.
Claim 4
Dependent Claim
34 words
METHYL ALGINATE HAVING NOT LESS THAN ABOUT 35% OF THE CARBOXYL GROUPS METHYLATED, SAID METHY ALGINATE BEING SUBSTANTIALLY IN AN UNDEGRADED STATE, AND THE REMAINING CARBOXYL GROUPS BEING PRESENT SUBSTANTIALLY AS WATER-SOLUBLE SALT GROUPS.
References Cited (Backward Citations)
US1924575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |