Patent US3446772A successfully refreshed from Google Patents.
US3446772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing high molecular weight polyalkylene terephthalates by intimately mixing a molten stream of low molecular weight polyalkylene terephthalate with a melt of higher molecular weight polyalkylene terephthalate
Assignee: Hoechst AG
•
Filing: 1965-07-29
•
Granted: 1969-05-27
•
Expires: 1985-07-29
Abstract
No abstract record available.
Inventors
- 👤 Paul-Friedrich Forster
- 👤 Herbert Kurzke
- 👤 Helmut Sattler
- 👤 Gunther Schnock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:06
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/785; B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/76; B29C48/03; B29C48/05; B29C48/06; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2758915A
Cited
US3337508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |