US3787451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxides of alkoxy-substituted tri(hydroxyphenyl)alkanes
Assignee: Dow Chemical Co
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Filing: 1971-08-19
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Granted: 1974-01-22
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Expires: 1991-08-19
Abstract
Abstract THE INVENTION COMPRISES POLYGLYCIDYL ETHERS OF ALKOXYSUBSTITUTED TRI(HYDROXYPHENYL)ALKANES, THEIR BLENDS WITH OTHER EPOXY COMPOUNDS AND THEIR CURED PRODUCTS. THESE EPOXITES ARE PREPARED BY A PROCESS WHEREIN THE COUPLING REACTION IS CARRIED OUT UNDER DIFFERENT CONDITIONS THAN THE SUBSEQUENT DEHYDROHALOGENATION STEP. THE RESULTING EPOXIDES DEMONSTRATE SUPERIOR AND UNEXPECTED COMBINATIONS OF HIGH-TEMPERATURE PROPERTIES AND FLEX STRENGTHS.
Inventors
- 👤 R Mah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:45
CPC Classifications
C; C07; C07D; C07D303/00; C07D303/02; C07D303/12; C07D303/18; C07D303/20; C07D303/24; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/32; C08G59/3218
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |