Patent US3305528A successfully refreshed from Google Patents.
US3305528A
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Poly (hydroxyethers) and a method for their preparation
Assignee: Union Carbide Corp
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Filing: 1960-11-30
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Granted: 1967-02-21
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Expires: 1980-11-30
Abstract
No abstract record available.
Inventors
- 👤 Wynstra John
- 👤 Norman H Reinking
- 👤 Austin E Barnabeo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:00
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2603; C08G65/2606; C08G65/2612
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A THERMOPLASTIC POLY(HYDROXYETHER), CHARACTERIZED BY THE ABSENCE OF EPOXY GROUPS, HAVING: A REDUCED VISCOSITY OF AT LEAST 0.43, MEASURED AT 25*C. IN TETRAHYDROFURAN AT A CONCENTRATION OF 0.2 GRAM PER 100 ML. OF SOLUTION; A MELT INDEX AT 220*C. OF LESS THAN ABOUT 5 DECI GRAMS PER MINUTE UNDER PRESSURE OF 44 P.S.I; A STABILITY INDEX OF LESS THAN ABOUT A 20 PERCENT CHANGE; AND A TENSILE IMPACT STRENGTH OF GREATER THAN ABOUT 75 FT.LBS./INCH3 AND CONSISTING ESSENTIALLY OF RECURRING UNITS OF THE FORMULA:
Claim 2
Dependent Claim
84 words
A THERMOPLASTIC POLY(HYDROXYETHER), CHARACTERIZED BY THE ABSENCE OF EPOXY GROUPS, HAVING: A REDUCED VISCOSITY OF AT LEAST 0.43, MEASURED AT 25*C. IN TETRAHYDROFURAN AT A CONCENTRATION OF 0.2 GRAM PER 100 ML. OF SOLUTION; A MELT INDEX AT 220*C. OF LESS THAN ABOUT 5 DECI GRAMS PER MINUTE UNDER PRESSURE OF 44 P.S.I; A STABILITY INDEX OF LESS THAN ABOUT A 20 PERCENT CHANGE; AND A TENSILE IMPACT STRENGTH OF GREATER THAN ABOUT 75 FT.LBS./INCH3 AND CONSISTING ESSENTIALLY OF RECURRING UNITS OF THE FORMULA:
References Cited (Backward Citations)
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Cited
US2456408A
Cited
GB681578A
Cited
US2694694A
Cited
US2767157A
Cited
US2854461A
Cited
US2811564A
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US2943096A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |