US3669916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A solution of a graft copolymer of cellulose
Assignee: Tomoegawa Paper Manufacturing Co Ltd
•
Filing: 1969-06-11
•
Granted: 1972-06-13
•
Expires: 1989-06-11
Abstract
Abstract The present invention is directed to a solution of a graft copolymer of cellulose comprising a polar organic solvent or a mixed solvent containing a polar or organic solvent, nitrogen dioxide and a graft copolymer of cellulose. Such solution is capable of dissolving cellulose and various kinds of polymers.
Inventors
- 👤 Osakazu Nakao
- 👤 Saburo Nakagawa
- 👤 Juichi Hirose
- 👤 Shigeyuki Yamazaki
- 👤 Takashi Amano
- 👤 Toshio Nakamura
- 👤 Hiroyuki Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:29
CPC Classifications
C; C08; C08B; C08B15/00; C08F; C08F251/00; C08F251/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |