US4136089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded articles of crystalline poly (ethylene/alkylene) terephthalates which crystallize rapidly
Assignee: Bayer AG
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Filing: 1977-08-16
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Granted: 1979-01-23
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Expires: 1997-08-16
Abstract
Abstract Terephthalic copolyesters, the diol component of which consists of ethylene glycol and 2.2-diethyl propane-1.3-diol crystallize more rapidly than pure polyethylene terephthalate and can be molded in a way comparable to butylene terephthalate.
Inventors
- 👤 Peter Bier
- 👤 Rudolf Binsack
- 👤 Hugo Vernaleken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:51
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/183; C08G63/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
Molded articles of highly crystalline, thermoplastic terephthalic acid copolyesters which crystallize rapidly and which consist of at least 90 mol %, relative to the dicarboxylic acid component, of terephthalic acid radicals, 95.2 to 99.5 mol %, relative to the diol component, of ethylene glycol radicals and 0.5 to 4.8 mol %, relative to the diol component, of 2.2-diethyl propane-1.3-diol radicals.
Claim 2
Dependent Claim
60 words
Molded articles of highly crystalline, thermoplastic terephthalic acid copolyesters which crystallize rapidly and which consist of at least 90 mol %, relative to the dicarboxylic acid component, of terephthalic acid radicals, 95.2 to 99.5 mol %, relative to the diol component, of ethylene glycol radicals and 0.5 to 4.8 mol %, relative to the diol component, of 2.2-diethyl propane-1.3-diol radicals.
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) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |