US3127375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing polymer using a
Assignee: —
•
Filing: —
•
Granted: 1964-03-31
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Expires: 1981-03-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:31
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/85
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
IN A PROCESS FOR PREPARING A POLYESTER BY THE SELFCONDENSATION WITH THE REMOVAL OF GYLCOL OF A BIS GLYCOL ESTER OF A DICARBOXYLIC ACID, THE IMPROVEMENT WHICH CONPRISES CARRYING OUT SAID CONDENSATION IN THE PRESENCE OF A CATALYTIC AMOUNT OF A COLUMBIUM COMPOUND.
Claim 2
Dependent Claim
43 words
IN A PROCESS FOR PREPARING A POLYESTER BY THE SELFCONDENSATION WITH THE REMOVAL OF GYLCOL OF A BIS GLYCOL ESTER OF A DICARBOXYLIC ACID, THE IMPROVEMENT WHICH CONPRISES CARRYING OUT SAID CONDENSATION IN THE PRESENCE OF A CATALYTIC AMOUNT OF A COLUMBIUM COMPOUND.
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) | 1967-03-31 | 1967-09-30 | 1968-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-31 | 1971-09-30 | 1972-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-31 | 1975-09-30 | 1976-03-31 | $7700.00 | Window Closed / Lapsed |