US3356641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diglycol terephthalate polyesters prepared by polycondensation in the presence of zinc hexafluorosilicate catalyst and optionally containing a manganese salt as a light stabilizing agent
Assignee: Glanzstoff AG
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Filing: 1964-03-03
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Granted: 1967-12-05
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Expires: 1984-03-03
Abstract
No abstract record available.
Inventors
- 👤 Roedel Hilmar
- 👤 Siggel Erhard
- 👤 Riehl Lothar
- 👤 Rein Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:56
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
IN A PROCESS FOR THE PRODUCTION OF A LINEAR FIBERFORMING POLYESTER BY POLYCONDENSATION UNDER REDUCED PRESSURE AND AT AN ELEVATED TEMPERATURE OFA DIGLYCOL TEREPHTHALATE, THE IMPROVEMENT WHICH COMPRISES; CARRYING OUT SAID POLYCONDENSATION IN THE PRESENCE OF ZINC HEXAFLUOROSILICATE AS THE ESSENTIAL POLYCONDENSATION CATALYST.
Claim 2
Dependent Claim
43 words
IN A PROCESS FOR THE PRODUCTION OF A LINEAR FIBERFORMING POLYESTER BY POLYCONDENSATION UNDER REDUCED PRESSURE AND AT AN ELEVATED TEMPERATURE OFA DIGLYCOL TEREPHTHALATE, THE IMPROVEMENT WHICH COMPRISES; CARRYING OUT SAID POLYCONDENSATION IN THE PRESENCE OF ZINC HEXAFLUOROSILICATE AS THE ESSENTIAL POLYCONDENSATION CATALYST.
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) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |