US2694698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interpolymerization of maleic anhydride and vinyl isobutyl ether
Assignee: GAF Chemicals Corp
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Filing: 1951-12-29
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Granted: 1954-11-16
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Expires: 1971-12-29
Abstract
No abstract record available.
Inventors
- 👤 Grosser Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:34
CPC Classifications
C; C08; C08F; C08F16/00; C08F16/12; C08F22/00; C08F22/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A METHOD COMPRISING PURIFYING MALEIC ANHYDRIDE TO REDUCE THE FREE MALEIC ACID CONTENT TO LESS THAN 0.3% BY WEIGHT OF THE ANHYDRIDE, MAINTAINING SAID FREE MALEIC ACID CONTENT AT LESS THAN 0.3% AND THEN COPOLYMERIZING THE PURIFIED MALEIC ANHYDRIDE WITH VINYL ISOBUTYL ETHER BY HEATING IN AN ORGANIC SOLVENT SOLUTION CONTAINING AN ORGANIC PEROXIDE CATALYST.
Claim 2
Independent Claim
55 words
A METHOD COMPRISING PURIFYING MALEIC ANHYDRIDE TO REDUCE THE FREE MALEIC ACID CONTENT TO LESS THAN 0.3% BY WEIGHT OF THE ANHYDRIDE, MAINTAINING SAID FREE MALEIC ACID CONTENT AT LESS THAN 0.3% AND THEN COPOLYMERIZING THE PURIFIED MALEIC ANHYDRIDE WITH VINYL ISOBUTYL ETHER BY HEATING IN AN ORGANIC SOLVENT SOLUTION CONTAINING AN ORGANIC PEROXIDE CATALYST.
References Cited (Backward Citations)
US2066105A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-15 | 1958-05-17 | 1958-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-15 | 1962-05-17 | 1962-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-15 | 1966-05-17 | 1966-11-16 | $7700.00 | Window Closed / Lapsed |