Patent US2580352A successfully refreshed from Google Patents.
US2580352A
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Preparation of sulfoethyl ethers of polysaccharides
Assignee: Hercules Powder Co
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Filing: 1949-03-31
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Granted: 1951-12-25
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Expires: 1969-03-31
Abstract
No abstract record available.
Inventors
- 👤 Vernon R Grassie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:21
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08; C08B31/12; C08B11/00; C08B11/02; C08B11/04; C08B11/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
THE PROCESS OF PREPARING A SULFONETHYL ETHER OF CELLULOSE WHICH COMPRISES HEATING A SUSPENSION OF AN ALKALI CELLULOSE IN AN INERT ORGANIC SOLVENT WITH AN ALKALI METAL SALT OF VINYL SULFONIC ACID TO A TEMPERATURE OF FROM ABOUT 65* C. TO ABOUT 90* C.
Claim 2
Dependent Claim
44 words
THE PROCESS OF PREPARING A SULFONETHYL ETHER OF CELLULOSE WHICH COMPRISES HEATING A SUSPENSION OF AN ALKALI CELLULOSE IN AN INERT ORGANIC SOLVENT WITH AN ALKALI METAL SALT OF VINYL SULFONIC ACID TO A TEMPERATURE OF FROM ABOUT 65* C. TO ABOUT 90* C.
References Cited (Backward Citations)
AT117056B
Cited
US2098335A
Cited
US2132181A
Cited
US2148554A
Cited
GB545812A
Cited
US2422000A
Cited
US2517577A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |