US3776945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of depolymerizing poly-ethylene terephthalate
Assignee: Societa Italiana Resine SpA SIR
•
Filing: 1971-11-16
•
Granted: 1973-12-04
•
Expires: 1991-11-16
Abstract
Abstract DIMETHYL TEREPHTHALATE AND ETHYLENE GLYCOL ARE RECOVERED FROM POLYETHYLENE TEREPHTHALATE BY DEPOLYMERISING IN METHANOL, INSTANTANEOUS EVAPORATION AFTER REMOVAL OF THE METHANOL, AND CONDENSATION OF THE VAPOURS IN COLD METHANOL.
Inventors
- 👤 F Ligorati
- 👤 G Aglietti
- 👤 V Nova
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:27
CPC Classifications
C; C08; C08J; C08J11/00; C07; C07C; C07C67/00; C07C67/03; C07C67/48; C07C67/52; C07C67/54; C08J2367/00; C08J2367/02
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |