US3297650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene terephthalate production
Assignee: HJ Zimmer Verfahrenstechnik
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Filing: 1963-03-18
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Granted: 1967-01-10
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Expires: 1983-03-18
Abstract
No abstract record available.
Inventors
- 👤 Halmi Gabor
- 👤 Advani Ram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:30
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
IN THE PROCESS FOR THE PRODUCTION OF SPINNABLE POLYESTER POLYMERS, WHICH POLYESTER POLYMERS ARE PRODUCED BY THE TRANSESTERIFICATION OF A DIMETHYL TEREPHTHALATE WITH AN ETHYLENE GLYCOL AND THE SUBSEQUENT POLYCONDENSATION OF THE TRANSESTERIFICATION PRODUCT; THE IMPROVEMENTS WHICH COMPRISES CATALYZING SUCH POLYMER PRODUCTION WITH THE SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM, BARIUM, CADMIUM, COBALT, LEAD, MANGANESE, TIN, ZINC, AND CHROMIUM, AND A MATERIAL SELECTED FROM THE GROUP CONSISTING OF HYDROXYBENZOPHENONE CARBOXYLIC ACIDS AND HYDROXYACETOPHENONE CARBOXYLIC ACIDS.
Claim 2
Dependent Claim
80 words
IN THE PROCESS FOR THE PRODUCTION OF SPINNABLE POLYESTER POLYMERS, WHICH POLYESTER POLYMERS ARE PRODUCED BY THE TRANSESTERIFICATION OF A DIMETHYL TEREPHTHALATE WITH AN ETHYLENE GLYCOL AND THE SUBSEQUENT POLYCONDENSATION OF THE TRANSESTERIFICATION PRODUCT; THE IMPROVEMENTS WHICH COMPRISES CATALYZING SUCH POLYMER PRODUCTION WITH THE SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM, BARIUM, CADMIUM, COBALT, LEAD, MANGANESE, TIN, ZINC, AND CHROMIUM, AND A MATERIAL SELECTED FROM THE GROUP CONSISTING OF HYDROXYBENZOPHENONE CARBOXYLIC ACIDS AND HYDROXYACETOPHENONE CARBOXYLIC ACIDS.
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) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |