US3772250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Branched aromatic polyesters containing cyanuryl nucleus radicals
Assignee: Unifrax I LLC
•
Filing: 1970-12-08
•
Granted: 1973-11-13
•
Expires: 1990-12-08
Abstract
Abstract BRANCHED, WHOLLY AROMATIC POLYESTERS OF FORMULA I 2-R2,4-R1,6-R3-S-TRIAZINE WHEREIN R1, R2 AND R3 EACH CONSIST ESSENTIALLY OF A PLURALITY OF MOIETIES SELECTED FROM THE GROUP HAVING THE FORMULAS II, III, AND IV -(O-(1,4-PHENYLENE)-CO)A-, -(CO-C6H4-CO)B-, -(O-C6H4-((X)M-C6H4)N-O)C- AND WHEREIN X IS -O-, -SO2-, OR -CO- M IS O OR 1; N IS O OR 1; A IS 0-40; B IS 0-20; C IS 0-20; AND A+B+CIS 2-40.
Inventors
- 👤 J Economy
- 👤 S Cottis
- 👤 B Nowak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:23
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08G63/6852; C08G63/91
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |