US2953544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters from the hydroxypropyl ether of hydroquinone
Assignee: Monsanto Chemicals Ltd
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Filing: 1957-06-14
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Granted: 1960-09-20
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Expires: 1977-06-14
Abstract
No abstract record available.
Inventors
- 👤 Ross M Hedrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:39
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
THE CRYSTALLINE, LINEAR, FIBER-FORMING POLYESTER CONDENSATION PRODUCT OF A TEREPHTHALIC COMPONENT SELECTED FROM THE CLASS CONSISTING OF TEREPHTHALIC ACID, A TEREPHTHALOYL HALIDE, AND ALKYL TEREPHTHALATE HAVING FROM 1 TO 5 CARBON ATOMS IN THE ALKYL RADICAL AND A HYDROXYALKYL TEREPHTHALATE HAVING FROM 2 TO 5 CARBON ATOMS IN THE HYDROXYALKYL RADICAL WITH A DIHYDROXY COMPONENT WHICH IS A MIXTURE CONSISTING ESSENTIALLY, ON A MOLAR BASIS, OF A MAJOR PROPORTION OF ETHYLENE GLYCOL AND A MINOR PROPORTION OF HYDROQUINONE BIS(3-HYDROXYPROPYL) ETHER.
Claim 2
Dependent Claim
80 words
THE CRYSTALLINE, LINEAR, FIBER-FORMING POLYESTER CONDENSATION PRODUCT OF A TEREPHTHALIC COMPONENT SELECTED FROM THE CLASS CONSISTING OF TEREPHTHALIC ACID, A TEREPHTHALOYL HALIDE, AND ALKYL TEREPHTHALATE HAVING FROM 1 TO 5 CARBON ATOMS IN THE ALKYL RADICAL AND A HYDROXYALKYL TEREPHTHALATE HAVING FROM 2 TO 5 CARBON ATOMS IN THE HYDROXYALKYL RADICAL WITH A DIHYDROXY COMPONENT WHICH IS A MIXTURE CONSISTING ESSENTIALLY, ON A MOLAR BASIS, OF A MAJOR PROPORTION OF ETHYLENE GLYCOL AND A MINOR PROPORTION OF HYDROQUINONE BIS(3-HYDROXYPROPYL) ETHER.
References Cited (Backward Citations)
GB678264A
Cited
US2626939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |