Copolymers of units i and ii
Abstract
Abstract 1. A METHOD FOR THE PRODUCTION OF FIBER AND FILM-FORMING AROMATIC POLYMERS WHOSE MOLECULAR CHAINS COMPRISE BENZENOLD GROUPS AND OXYGEN ATOMS, IN WHCIH A DIHALOGENOBENZENOID COMPOUND HAVING THE FORMULA X-PHENYLENE-Y-PHENYLENE-X'' IN WHICH X AND X'' ARE EACH A HALOGEN ATOM AND Y IS -SO2-, -SO-, -CO-, OR A RADICAL OF THE FORMULA -Y''-A-Y"- IN WHICH Y'' AND y" EACH IS -SO2-, -SO- OR -CO- AND A IS A BIVALENT AROMATIC RADICAL HAVING BOTH VALENCIES LINKED TO CARBON ATOMS IS CAUSED TO REACT WITH A SUBSTANTIALLY EQUIVALENT AMOUNT OF AN ALKALI METAL HYDROXIDE BY THE DISPLACEMENT OF ALKALI METAL HALIDE IN A POLAR LIQUID WHICH IS AN IONIZING SOLVENT FOR ALKALI METAL PHENOXIDES AND IS STABLE UNDER THE REACTION CONDITIONS EMPLOYED, THE REACTION BEING CONCLUDED UNDER ANHYDROUS CONDITIONS AND AT A TEMPERATURE BETWEEN 150*C., AND 350*C.
Inventors
No inventors recorded.
Bibliographic Details
Claims Analysis
Total Claims: 2References 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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |