Patent US2694697A successfully refreshed from Google Patents.
US2694697A
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
2026-10-28 23:54
CPC Classifications
C; C08; C08F; C08F8/00; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A PROCESS COMPRISING ADDING TO A MALEIC ANHYDRIDEVINYL ISOBUTYL ETHER COPOLYMER SOLUTION IN A WATER SOLUBLE INERT ORGANIC SOLVENT HAVING A BOILING POINT OF FROM ABOUT 30* TO 85 * C., 1 MOLE OF WATER PER MOLE OF ANHYDRIDE, AND HEATING THE SOLUTION TO PARTIALLY HYDROLYZE THE COPOLYMER.
Claim 2
Dependent Claim
48 words
A PROCESS COMPRISING ADDING TO A MALEIC ANHYDRIDEVINYL ISOBUTYL ETHER COPOLYMER SOLUTION IN A WATER SOLUBLE INERT ORGANIC SOLVENT HAVING A BOILING POINT OF FROM ABOUT 30* TO 85 * C., 1 MOLE OF WATER PER MOLE OF ANHYDRIDE, AND HEATING THE SOLUTION TO PARTIALLY HYDROLYZE THE COPOLYMER.
References Cited (Backward Citations)
US2066105A
Cited
US2565147A
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 |