US2578660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing ethylene glycol terephthalate
Assignee: EIDP Inc
•
Filing: 1949-09-21
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Granted: 1951-12-18
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Expires: 1969-09-21
Abstract
No abstract record available.
Inventors
- 👤 Auspos Lawrence Arthur
- 👤 Dempster Jane Bowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:43
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/85; C08G63/86; C08G63/863
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A PROCESS FOR THE MANUFACTURE OF POLYMERIC ETHYLENE GLYCOL TERAPHTHALATE, WHICH COMPRISES POLYMERIZING MONOMERIC ETHYLENE GLYCOL TEREPHTHALATE IN THE PRESENCE OF A CATALYST TAKEN FROM THE CLASS CONSISTING OF GERMANIUM AND GERMANIUM OXIDE.
Claim 2
Dependent Claim
33 words
A PROCESS FOR THE MANUFACTURE OF POLYMERIC ETHYLENE GLYCOL TERAPHTHALATE, WHICH COMPRISES POLYMERIZING MONOMERIC ETHYLENE GLYCOL TEREPHTHALATE IN THE PRESENCE OF A CATALYST TAKEN FROM THE CLASS CONSISTING OF GERMANIUM AND GERMANIUM OXIDE.
References Cited (Backward Citations)
US2465319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |