Patent US793549A successfully refreshed from Google Patents.
Patent US3580973A successfully refreshed from Google Patents.
US3580973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyoxymethylene-formal-containing polyester block polymer
Assignee: Celanese Corp
•
Filing: 1967-12-18
•
Granted: 1971-05-25
•
Expires: 1987-12-18
Abstract
Abstract A NOVEL PROCESS FOR THE PRODUCTION OF STABILIZED OXYMETHYLENE POLYMERS IS PRESENTED WHEREIN A POLYOXYMETHYLENE-POLYESTER BLOCK POLYMER IS PREPARED BY REACTING A LINEAR, FORMAL-CONTAINING POLYESTER WITH TRIOXANE UNDER TRIOXANE POLYMERIZATION CONDITIONS.
Inventors
- 👤 Daniel M Kennedy Jr
- 👤 Carl Naeher Zellner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:08
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08G2/00; C08G2/38
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |