US2531469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl sulfonates and process for preparing the same
Assignee: Eastman Kodak Co
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Filing: 1949-04-14
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Granted: 1950-11-28
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Expires: 1969-04-14
Abstract
No abstract record available.
Inventors
- 👤 Delbert D Reynolds
- 👤 William O Kenyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:30
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/36; C08F8/30; C08F8/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR PREPARING A POLYVINYL SULFONATE COMPRISING DISSOLVING POLYVINYL ALCOHOL IN A SOLVENT SELECTED FROMT HE GROUP CONSISITNG OF WATER, AN ALKYL SULFONIC ACID, AN ARYL SULFONIC ACID, A MIXTURE OF WATER AND AN ALKYL SULFONIC ACID AND A MIXTURE OF WATER AND AN ARYL SULFONIC ACID, PRECIPITATING THE POLYVINYL ALCOHOL BY ADDING THE RESULTING SOLUTION TO PYRIDINE, SEPARATING THE PRECIPITATED POLYVINYL ALCOHOL, USSPENDING THE POLYVINYL ALCOHOL IN SUBSTANTIALLY DRY PYRIDINE, COOLING THE RESULTING SUSPENSION OF THE POLYVINYL ALCOHOL TO FROM 0* TO 20*C., THEN ADDING TO THE COOLED SUSPENSION A SULFONATING AGENT SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
105 words
A PROCESS FOR PREPARING A POLYVINYL SULFONATE COMPRISING DISSOLVING POLYVINYL ALCOHOL IN A SOLVENT SELECTED FROMT HE GROUP CONSISITNG OF WATER, AN ALKYL SULFONIC ACID, AN ARYL SULFONIC ACID, A MIXTURE OF WATER AND AN ALKYL SULFONIC ACID AND A MIXTURE OF WATER AND AN ARYL SULFONIC ACID, PRECIPITATING THE POLYVINYL ALCOHOL BY ADDING THE RESULTING SOLUTION TO PYRIDINE, SEPARATING THE PRECIPITATED POLYVINYL ALCOHOL, USSPENDING THE POLYVINYL ALCOHOL IN SUBSTANTIALLY DRY PYRIDINE, COOLING THE RESULTING SUSPENSION OF THE POLYVINYL ALCOHOL TO FROM 0* TO 20*C., THEN ADDING TO THE COOLED SUSPENSION A SULFONATING AGENT SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
US2395347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |