US3705133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester process
Assignee: Honeywell International Inc
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Filing: 1969-08-21
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Granted: 1972-12-05
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Expires: 1989-08-21
Abstract
Abstract A PROCESS FOR THE PREPARATION OF COLORLESS, LINEAR HIGH MOLECULAR WEIGHT FILM AND FIBER-FORMING POLYALKYLENE TEREPHTHALATES EITHER BY DIRECT ESTERIFICATION OR ESTERINTERCHANGE OF TEREPHTHALIC ACID AND/OR THE LOWER ALKYL ESTERS THEREOF WITH A GLYCOL HAVING 2 TO 10 CARBON ATOMS PER MOLECULE TO OBTAIN THE CORRESPONDING DIGLYCOL-ESTER INTERMEDIATE AND THEN CONDENSING SAID INTERMEDIATE IN THE PRESENCE OF A CATALYTIC AMOUNT OF A LEAST ONE TRIVALENT ANTIMONY SALT OF A HIGHER ALIPHATIC MONOCARBOXYLIC ACID HAVING AT LEAST 12 CARBON ATOMS PER MOLECULE.
Inventors
- 👤 Stanley D Lazarus
- 👤 Paul N Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:55
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/85; C08G63/86; C08G63/866
Claims Analysis
Total Claims: 0
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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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |