US2520609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked polymeric materials and method of making same
Assignee: EIDP Inc
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Filing: 1947-10-16
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Granted: 1950-08-29
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Expires: 1967-10-16
Abstract
No abstract record available.
Inventors
- 👤 Paul W Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:52
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/244; D06M13/248; C; C08; C08B; C08B15/00; C08B15/005; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/378; D01; D01F; D01F2/00; D01F2/24; D01F2/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A METHOD OF INSOLUBILIZING HYDROXYETHYLCELLULOSE ACETATE CHLOROACETATE WHICH COMPRISES CROSS-LINKING THE SAID CHLOROACETATE BY HEATING IT AT A TEMPERATURE OF ABOUT 100*C. WITH A DERIVATIVE OF DITHIOCARBAMIC ACID SELECTED FROM THE CLASS WHICH CONSISTS OF SALTS OF DITHIOCARBAMIC ACID, ESTERS OF DITHIOCARBAMIC ACID, THIURAM SULFIDES, THIAZOLINES AND THIAZOLES, SAID DERIVATIVE CONTAINING NO RADICAL HAVING MORE THAN 8 CARBON ATOMS.
Claim 2
Independent Claim
59 words
A METHOD OF INSOLUBILIZING HYDROXYETHYLCELLULOSE ACETATE CHLOROACETATE WHICH COMPRISES CROSS-LINKING THE SAID CHLOROACETATE BY HEATING IT AT A TEMPERATURE OF ABOUT 100*C. WITH A DERIVATIVE OF DITHIOCARBAMIC ACID SELECTED FROM THE CLASS WHICH CONSISTS OF SALTS OF DITHIOCARBAMIC ACID, ESTERS OF DITHIOCARBAMIC ACID, THIURAM SULFIDES, THIAZOLINES AND THIAZOLES, SAID DERIVATIVE CONTAINING NO RADICAL HAVING MORE THAN 8 CARBON ATOMS.
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) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |