US3697481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromanyl terminated polycarbonate
Assignee: General Electric Co
•
Filing: 1971-03-08
•
Granted: 1972-10-10
•
Expires: 1991-03-08
Abstract
Abstract A CARBONATE POLYMER CONTAINING AS TERMINAL GROUPS A CHROMANYL RADICAL OF THE FOLLOWING FORMULA: (4-(2-R1,2-R2,3-R3,4-R4,R7,R8-CHROMAN-4-YL)PHENYL)-O- WHEREIN R1-R8 ARE INDEPENDENTLY SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND ALKYL RADICALS OF 1-9 CARBON ATOMS AND WHEREIN R5-R8 ARE FURTHER INDEPENDENTLY SELECTED FROM THE GROUP CONSISTING OF BROMINE AND CHLORINE.
Inventors
- 👤 Charles A Bialous
- 👤 Allen J Campbell
- 👤 Frank N Liberti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:31
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |