US3736290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making polyimide block copolymers
Assignee: General Electric Co
•
Filing: 1972-03-01
•
Granted: 1973-05-29
•
Expires: 1992-03-01
Abstract
Abstract A METHOD IS PROVIDED FOR MAKING POLYIMIDE-ORGANIC BLOCK POLYMERS, SUCH ASPOLYIMIDE-POLYDIORGANOSILOXANE BLOCK COPOLYMERS INVOLVING THE REACTION OF BISIMIDES AND ORGANO DIAMINES IN THE PRESENCE OF AN ORGANIC SOLVENT, SUCH AS HEXAMETHYLPHOSPHORICTRIAMIDE.
Inventors
- 👤 W Fessler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:00
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/1064; C08G73/1003; C08G73/1007; C08G77/00; C08G77/42; C08G77/452; C08G77/455
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |