Patent US3671488A successfully refreshed from Google Patents.
US3671488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal stabilization of addition polymers
Assignee: Celanese Corp
•
Filing: 1966-05-19
•
Granted: 1972-06-20
•
Expires: 1986-05-19
Abstract
Abstract A composition comprising an addition polymer and a stabilizing amount of a compound selected from the group consisting of 9,10dihydroanthracene, (1-8)-octahydroanthracene, phenanthrene, (18)-octahydrphenanthrene, acenaphthylene and (1-4)tetrahydroacenaphthene.
Inventors
- 👤 Dagobert E Stuetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:39
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/01
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |