Patent FR476440A successfully refreshed from Google Patents.
US3729451A
Expired / Lapsed
US
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Process for copolymerization of maleic anhydride with 1-olefins
Assignee: Gulf Research and Development Co
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Filing: 1972-07-10
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Granted: 1973-04-24
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Expires: 1992-07-10
Abstract
Abstract MALEIC ANHYDRIDE AND POLYMERIZABLE LIQUID 1-OLEFINS HAVING FROM 4 TO 14 CARBON ATOMS ARE COPOLYMERS EMPLOYING A LIQUID-LIQUID DISPERSION AS THE REACTION MIXTURE BY USE OF EXCESS LIQUID 1-OLEFIN AS A DILUENT AND A MINOR AMOUNT OF A COPOLYMER OF MALEIC ANHYDRIDE WITH AN ALIPHATIC 1-OLEFIN HAVING FROM 14 TO 18 CARBON ATOMS AS A DISPERSING AGENT. MALEIC ANHYDRIDE AND A POLYMERIZATION INITIATOR BECOME DISPERSED IN THE MIXTURE OF OLEFIN AND DISPERSING AGENT AND POLYMERIZATION TAKES PLACE WHEN THE TEMPERATURE IS RAISED TO ABOUT 80*C. WITH AGITATION.
Inventors
- 👤 R Blecke
- 👤 R Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:30
CPC Classifications
C; C08; C08F; C08F267/00; C08F267/04; C08F10/00; C08F22/00; C08F22/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |