US3053809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphine-metal compound catalyst
Assignee: Celanese Corp
•
Filing: 1958-04-15
•
Granted: 1962-09-11
•
Expires: 1978-04-15
Abstract
No abstract record available.
Inventors
- 👤 Robert G Linville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:55
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/87
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN THE PROCESS FOR THE PRODUCTION OF LINEAR FIBERFORMING HIGH POLYESTERS BY THE CONDENSATION OF AN ESTER OF A DICARBOXYLIC ACID FREE OF ETHYLENIC UNSATURATION AND A GLYCOL WITH LIBERATION OF THE GLYCOL, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE CONDENSATION IN THE PRESENCE OF A METAL COMPOUND OF THE GROUP CONSISTING OF OXIDES, CHLORIDES, CARBOXYLIC ACID SALTS, PHOSPHATES AND HYRHOSPHITES OF ZINC, ANTIMONY, LITHIUM, MAGNESIUM, CALCIUM AND MANGANESE AND A TERTIARY ORGANOPHOSPHINE, SAID METAL COMPOUND BEING PRESENT IN AN AMOUNT BETWEEN 0.0005 AND ABOUT 0.5% BASED ON THE WEIGHT OF THE POLYESTER AND SAID ORGANOPHOSPHINE BEING PRESENT IN AN AMOUNT SUFFICIENT TO PROCIDE FROM 1/2 TO 30 ATOMS OF PHOSPHOROUS PER ATOM OF METAL IN SAID METAL COMPOUND.
Claim 2
Dependent Claim
118 words
IN THE PROCESS FOR THE PRODUCTION OF LINEAR FIBERFORMING HIGH POLYESTERS BY THE CONDENSATION OF AN ESTER OF A DICARBOXYLIC ACID FREE OF ETHYLENIC UNSATURATION AND A GLYCOL WITH LIBERATION OF THE GLYCOL, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE CONDENSATION IN THE PRESENCE OF A METAL COMPOUND OF THE GROUP CONSISTING OF OXIDES, CHLORIDES, CARBOXYLIC ACID SALTS, PHOSPHATES AND HYRHOSPHITES OF ZINC, ANTIMONY, LITHIUM, MAGNESIUM, CALCIUM AND MANGANESE AND A TERTIARY ORGANOPHOSPHINE, SAID METAL COMPOUND BEING PRESENT IN AN AMOUNT BETWEEN 0.0005 AND ABOUT 0.5% BASED ON THE WEIGHT OF THE POLYESTER AND SAID ORGANOPHOSPHINE BEING PRESENT IN AN AMOUNT SUFFICIENT TO PROCIDE FROM 1/2 TO 30 ATOMS OF PHOSPHOROUS PER ATOM OF METAL IN SAID METAL COMPOUND.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |