Patent US3297657A successfully refreshed from Google Patents.
US3297657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Styrene-maleic anhydride copolymerization process
Assignee: Deering Milliken Research Corp
•
Filing: 1963-03-08
•
Granted: 1967-01-10
•
Expires: 1983-03-08
Abstract
No abstract record available.
Inventors
- 👤 Michael H Gray
- 👤 Jr Hay F Sparks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:58
CPC Classifications
C; C08; C08F; C08F222/00; C08F222/04; C08F222/06; C08F222/08; C08F22/00; C08F22/04; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A METHOD FOR LIMITING THE VISCOSITY RISE OF THE REACTION MASS IN A REACTION OF STYRENE AND MALEIC ANHYDRIDE TO PRODUCE A STYRENE-MALEIC ANHYDRIDE COPOLYMER IN AN ORGAINC SOLVENT SYSTEM IN WHICH THE REACTION PRODUCT IS SWELLABLE WHICH COMPRISES ACHIEVING A MIXING OF THE MIXTURE DURING POLYMERIZATION BY SUBJECTING THE REACTION MIXTURE TO TUMBLING BODIES INDUCED GRINDING ACTION, THEREBY SUBSTANTIALLY REDUCING VISCOSITY RISE DUE TO SWELLING OF THE COPOLYMER.
Claim 2
Independent Claim
69 words
A METHOD FOR LIMITING THE VISCOSITY RISE OF THE REACTION MASS IN A REACTION OF STYRENE AND MALEIC ANHYDRIDE TO PRODUCE A STYRENE-MALEIC ANHYDRIDE COPOLYMER IN AN ORGAINC SOLVENT SYSTEM IN WHICH THE REACTION PRODUCT IS SWELLABLE WHICH COMPRISES ACHIEVING A MIXING OF THE MIXTURE DURING POLYMERIZATION BY SUBJECTING THE REACTION MIXTURE TO TUMBLING BODIES INDUCED GRINDING ACTION, THEREBY SUBSTANTIALLY REDUCING VISCOSITY RISE DUE TO SWELLING OF THE COPOLYMER.
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) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |