US3594350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esterification of terephthalic acid with an alkylene glycol in the presence of ammonia or an ammonium salt of a dibasic carboxylic acid
Assignee: Honeywell International Inc
•
Filing: 1969-10-06
•
Granted: 1971-07-20
•
Expires: 1989-10-06
Abstract
Abstract THE ESTERIFICATION OF POLYCARBOXYLIC ACID WITH AN ALKYLENE GLYCOL IS DESCRIBED UNDER CONDITIONS OF DIRECT ESTERIFICATION WHEREIN THE POLYCARBOXYLIC ACID IS ESTERIFIED WITH AN ALKYLENE GLYCOL IN THE PRESENCE OF AMMONIA OR AN AMMONIUM SALT OF A DIBASIC CARBOXYLIC ACID.
Inventors
- 👤 Robert A Lofquist
- 👤 Lamberto Crescentini
- 👤 Laszlo J Balint
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:26
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/87
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |