Patent US3781248A successfully refreshed from Google Patents.
US3781248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing acrylic copolymer
Assignee: Toray Industries Inc
•
Filing: 1971-08-12
•
Granted: 1973-12-25
•
Expires: 1991-08-12
Abstract
Abstract A MONOMER MIXTURE CONSISTING ESSENTIALLY OF ACRYLONITRILE, A POLYMERIZABLE VINYL MONOMER MORE HYDROPHOBIC THAN ACRYLONITRILE AND A POLYMERIZABLE VINYL MONOMER MORE HYDROPHILIC THAN ACRYLONITRILE IS POLYMERIZED IN A REACTION MEDIUM CONSISTING OF DIMETHYL SULFOXIDE AND WATER. A RELATIVELY HOMOGENEOUS ACRYLIC COPOLYMER DISPERSION IS OBTAINED WITHIN A RELATIVELY SHORT PERIOD OF TIME AT A HIGH CONVERSION RATIO.
Inventors
- 👤 H Sakai
- 👤 I Ito
- 👤 Z Izumi
- 👤 S Hamada
- 👤 Y Yamanaka
- 👤 S Hosaka
- 👤 Z Suzuki
- 👤 T Kato
- 👤 H Kitagawa
- 👤 E Mukoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:32
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |