US3682864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of polyesters,more particularly linear polyalkylene terephthalates,and catalyst employed therefor
Assignee: SNIA Viscosa SpA
•
Filing: 1970-03-16
•
Granted: 1972-08-08
•
Expires: 1990-03-16
Abstract
Abstract A METHOD FOR THE PRODUCTION OF POLYESTERS, MORE PARTICULARLY LINEAR POLYALKYLENE TEREPHTHALATES IS DISCLOSED, WHEREIN THE POLYCONDENSATION STEP IS CARRIED OUT BY USING AS A CATALYST AN ASSOCIATION OF ELEMENTAL ANTIMONY WITH INSOLUBLE TITANIUM COMPOUNDS. TITANIUM HYDRIDE, CARBIDE, NITRIDE, BORIDE OR PHOSPHITE ARE THE PREFERRED TITANIUM COMPOUNDS. IN ADDITION TO ACCELERATING THE POLYCONDENSATION REACTION, THE CATALYST SYSTEM OF THIS INVENTION HAS NO DETRIMENTAL EFFECT OF THE WHITENESS RATING OF THE FINISHED POLYMERS.
Inventors
- 👤 Francesco Siclari
- 👤 Edgardo Horak
- 👤 Mario Rosso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:02
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/85
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |