US2643989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cerium esterification catalyst
Assignee: EIDP Inc
•
Filing: 1949-09-20
•
Granted: 1953-06-30
•
Expires: 1969-09-20
Abstract
No abstract record available.
Inventors
- 👤 Auspos Lawrence Arthur
- 👤 Dempster Jane Bowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:54
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A PROCESS FOR THE MANUFACTURE OF A POLYMERIZED ESTER OF TEREPHTHALIC ACID, WHICH COMPRISES REACTING A GLYCOL OF THE GENERAL FORMULA
Claim 2
Dependent Claim
21 words
A PROCESS FOR THE MANUFACTURE OF A POLYMERIZED ESTER OF TEREPHTHALIC ACID, WHICH COMPRISES REACTING A GLYCOL OF THE GENERAL FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |