US3039999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hypophosphite color-forming inhibitor in polyester condensation
Assignee: Celanese Corp
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Filing: 1958-04-15
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Granted: 1962-06-19
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Expires: 1978-04-15
Abstract
No abstract record available.
Inventors
- 👤 Robert G Linville
- 👤 Robert J Osborne
- 👤 Charles L Smart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:47
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/87; C08G63/83; C08K; C08K3/00; C08K3/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
IN THE PROCESS FOR THE PRODUCTION OF LINEAR FIBER FORMING HIGH POLYESTERS BY THE CONDENSATION IN LIQUID CONDITION OF A BIS-GYLCOL ESTER OF TEREPHTHALIC ACID AND ETHYLENE GLYCOL IN THE PRESENCE OF ABOUT 0.005 TO ABOUT 0.5 WT, PERCENT OF A CATALYST COMPRISING A COMPOUND FROM THE GROUP CONSISTING OF ZINC CHLORIDE, ZINC CARBONATE, LITHIUM ACETATE, MAGNESIUM ACETATE, MANGANESE ACETATE, LITHIUM CARBONATE AND ZINC OXIDE, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE CONDENSATION IN THE PRESENCE OF ABOUT 0.005 TO ABOUT 2 WT. PERCENT OF A METAL HYPOPHOSPHITE SALT.
Claim 2
Dependent Claim
88 words
IN THE PROCESS FOR THE PRODUCTION OF LINEAR FIBER FORMING HIGH POLYESTERS BY THE CONDENSATION IN LIQUID CONDITION OF A BIS-GYLCOL ESTER OF TEREPHTHALIC ACID AND ETHYLENE GLYCOL IN THE PRESENCE OF ABOUT 0.005 TO ABOUT 0.5 WT, PERCENT OF A CATALYST COMPRISING A COMPOUND FROM THE GROUP CONSISTING OF ZINC CHLORIDE, ZINC CARBONATE, LITHIUM ACETATE, MAGNESIUM ACETATE, MANGANESE ACETATE, LITHIUM CARBONATE AND ZINC OXIDE, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE CONDENSATION IN THE PRESENCE OF ABOUT 0.005 TO ABOUT 2 WT. PERCENT OF A METAL HYPOPHOSPHITE SALT.
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) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |