Patent US3060223A successfully refreshed from Google Patents.
US3060223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of dihydroxyethyl terephthalate
Assignee: Standard Oil Co
•
Filing: 1960-03-17
•
Granted: 1962-10-23
•
Expires: 1980-03-17
Abstract
No abstract record available.
Inventors
- 👤 Aubrey R Mckinney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:19
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C07C69/82; C07C67/00; C07C67/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A METHOD OF MAKING 1,4 BIS(HYDROXYETHYL)TEREPHTHALATE WHICH METHOD COMPRISES CONTACTING ETHYLENE GLYCOL AND TEREPHTHALIC ACID, IN A MOLE RATIO OF SAID GLYCOL TO SAID ACID OF ABOUT 3-12, AT A TEMPERATURE OF ABOUT 260*C., FOR A TIME OF ABOUT 30-90 MINUTES, IN THE PRESENCE OF ABOUT 0.05-0.1 WEIGHT PERCENT OF MANGANOUS ACETATE.
Claim 2
Independent Claim
52 words
A METHOD OF MAKING 1,4 BIS(HYDROXYETHYL)TEREPHTHALATE WHICH METHOD COMPRISES CONTACTING ETHYLENE GLYCOL AND TEREPHTHALIC ACID, IN A MOLE RATIO OF SAID GLYCOL TO SAID ACID OF ABOUT 3-12, AT A TEMPERATURE OF ABOUT 260*C., FOR A TIME OF ABOUT 30-90 MINUTES, IN THE PRESENCE OF ABOUT 0.05-0.1 WEIGHT PERCENT OF MANGANOUS ACETATE.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-22 | 1966-04-23 | 1966-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-22 | 1970-04-23 | 1970-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-22 | 1974-04-23 | 1974-10-23 | $7700.00 | Window Closed / Lapsed |