US3067178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesterification process
Assignee: Millennium Petrochemicals Inc
•
Filing: 1957-04-17
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Granted: 1962-12-04
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Expires: 1977-04-17
Abstract
No abstract record available.
Inventors
- 👤 Greenberg Harry
- 👤 Stanley P Rowland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:11
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/85; C08G63/02; C08G63/12; C08G63/16; C08G63/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR PREPARING A POLYMERIC POLYESTER WHICH COMPRISES SUBJECTING A DICARBOXYLIC ACID TO REACTION WITH A SATURATED GLYCOL AT A TEMPERATURE OF ABOUT 100* TO ABOUT 250*C. IN THE PRESENT OF ABOUT 0.01 TO ABOUT 1 PERCENT, BASED ON THE WEIGHT OF THE DICARBOXYLIC ACID, OF A COMBINATION CATALYST CONSISTD ESSENTIALLY OF ABOUT ONE MOL OF A TITANIUM TETRAHALIDE IN MIXTURE WITH FROM ABOUT 0.1 TO ABOUT TEN MOLS OF A ZINC-CONTAINING COMPONENT FROM THE GROUP CONSISTING OF ZINC AND A ZINC HALIDE.
Claim 2
Dependent Claim
84 words
A PROCESS FOR PREPARING A POLYMERIC POLYESTER WHICH COMPRISES SUBJECTING A DICARBOXYLIC ACID TO REACTION WITH A SATURATED GLYCOL AT A TEMPERATURE OF ABOUT 100* TO ABOUT 250*C. IN THE PRESENT OF ABOUT 0.01 TO ABOUT 1 PERCENT, BASED ON THE WEIGHT OF THE DICARBOXYLIC ACID, OF A COMBINATION CATALYST CONSISTD ESSENTIALLY OF ABOUT ONE MOL OF A TITANIUM TETRAHALIDE IN MIXTURE WITH FROM ABOUT 0.1 TO ABOUT TEN MOLS OF A ZINC-CONTAINING COMPONENT FROM THE GROUP CONSISTING OF ZINC AND A ZINC HALIDE.
References Cited (Backward Citations)
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US1985343A
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US2249950A
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US2437232A
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US2729619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-03 | 1966-06-04 | 1966-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-03 | 1970-06-04 | 1970-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-03 | 1974-06-04 | 1974-12-04 | $7700.00 | Window Closed / Lapsed |