US3126360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycondensation catalysts for im-
Assignee: —
•
Filing: —
•
Granted: 1964-03-24
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Expires: 1981-03-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:52
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/87; C08G63/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS FOR THE PRODUCTION OF POLYETHYLENE TEREPHTHALATE WHICH COMPRISES: CARRYING OUT AN ESTER INTERCHANGE BETWEEN DIMETHYL TEREPHTHALATE AND ETHYLENE GLYCOL; AND POLYCONDENSING THE RESULTING DIGLYCOL TEREPHTHALATE IN THE PRESENCE OF A POLYCONDENSATION CATALYST SELECTED FROM THE GROUP CONSISTING OF BENZIL, FURIL, BENZFURIL, ANISIL, BENAVANILLIL, BIACETYL, BENZOIN, FUROIN, SALICOIN, BENZFUROIN, BENZILIDIOXIME AND ITS ALKALI METAL SALTS, BIACETYL DIOXIME AND ITS ALAKALI METAL SALTS, BENZSALICIL, ACETOPHENONE, BENZOPHENONE, FLUORENONE, METHYL-ISOBUTYLKETONE, 4-METHYLCYCLOHEXANONE, DIMEDONE, NINHYDRIN, ACYCLOPENTANONE CARBOXYLIC ACID AND ITS ETHYL ESTER, A-CYCLOHEXANONE CARBOXYLIC ACID AND ITS ALKALI METAL SALTS, 2BUTYLCYCLOHEXANONE BENZILIC ACID AND ITS ALKALI METAL SALTS, MANDELIC ACID AND ITS ALKALI METAL SALTS, AND ACETYLSALICYCLIC ACID AND ITS ALKALI METAL SALTS.
Claim 2
Dependent Claim
109 words
A PROCESS FOR THE PRODUCTION OF POLYETHYLENE TEREPHTHALATE WHICH COMPRISES: CARRYING OUT AN ESTER INTERCHANGE BETWEEN DIMETHYL TEREPHTHALATE AND ETHYLENE GLYCOL; AND POLYCONDENSING THE RESULTING DIGLYCOL TEREPHTHALATE IN THE PRESENCE OF A POLYCONDENSATION CATALYST SELECTED FROM THE GROUP CONSISTING OF BENZIL, FURIL, BENZFURIL, ANISIL, BENAVANILLIL, BIACETYL, BENZOIN, FUROIN, SALICOIN, BENZFUROIN, BENZILIDIOXIME AND ITS ALKALI METAL SALTS, BIACETYL DIOXIME AND ITS ALAKALI METAL SALTS, BENZSALICIL, ACETOPHENONE, BENZOPHENONE, FLUORENONE, METHYL-ISOBUTYLKETONE, 4-METHYLCYCLOHEXANONE, DIMEDONE, NINHYDRIN, ACYCLOPENTANONE CARBOXYLIC ACID AND ITS ETHYL ESTER, A-CYCLOHEXANONE CARBOXYLIC ACID AND ITS ALKALI METAL SALTS, 2BUTYLCYCLOHEXANONE BENZILIC ACID AND ITS ALKALI METAL SALTS, MANDELIC ACID AND ITS ALKALI METAL SALTS, AND ACETYLSALICYCLIC ACID AND ITS ALKALI METAL SALTS.
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) | 1967-03-24 | 1967-09-23 | 1968-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-24 | 1971-09-23 | 1972-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-24 | 1975-09-23 | 1976-03-24 | $7700.00 | Window Closed / Lapsed |