Patent US3359281A successfully refreshed from Google Patents.
US3359281A
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Separation and isolation of 2, 2, (2, 4'-dihydroxydiphenyl) propane and 2, 2, 4-trimethyl 4(4'-hydroxyphenyl) chroman from mixtures containing the same
Assignee: Hooker Chemical Corp
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Filing: 1964-12-04
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Granted: 1967-12-19
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Expires: 1984-12-04
Abstract
No abstract record available.
Inventors
- 👤 Hans L Schlichting
- 👤 Ellis I Lichtblau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:55
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/123; C08G63/133; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS FOR SEPARATING 2,2,4-TRIMETHYL 4)4-HYDROXYPHENYL)CHOMAN FROM MIXTURES CONTAINING THE SAID CHROMAN AND A COMPOUND WHICH CANNOT BE SUCCESSFULLY SEPARATED FROM THE CHROMAN DY DISTILLATION OR BY CONVENTIONAL EXTRACTION METHODS COMPRISING ADDING A CLATHRATING AGENT SELECTED FROM THE ROUP CONSISTING OF SHORT CHAIN ALIPHATIC ALCOHOLS, AND SHORT CHAIN ALIPHATIC KETONES TO A MIXTURE CONTAINING 2,2,4-TRIMETHYL 4)4''HYDROXYPHENYL)CHROMAN, FORMING A CRYSTALLINE CLATHRATE INCLUSION COMPOUND WITH SAID CHOMAN AND SEPARATING THE CRYSTALLINECOMPOUND FROM THE MEDIUAM
Claim 2
Dependent Claim
72 words
A PROCESS FOR SEPARATING 2,2,4-TRIMETHYL 4)4-HYDROXYPHENYL)CHOMAN FROM MIXTURES CONTAINING THE SAID CHROMAN AND A COMPOUND WHICH CANNOT BE SUCCESSFULLY SEPARATED FROM THE CHROMAN DY DISTILLATION OR BY CONVENTIONAL EXTRACTION METHODS COMPRISING ADDING A CLATHRATING AGENT SELECTED FROM THE ROUP CONSISTING OF SHORT CHAIN ALIPHATIC ALCOHOLS, AND SHORT CHAIN ALIPHATIC KETONES TO A MIXTURE CONTAINING 2,2,4-TRIMETHYL 4)4''HYDROXYPHENYL)CHROMAN, FORMING A CRYSTALLINE CLATHRATE INCLUSION COMPOUND WITH SAID CHOMAN AND SEPARATING THE CRYSTALLINECOMPOUND FROM THE MEDIUAM
References Cited (Backward Citations)
US3169996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-18 | 1971-06-19 | 1971-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-18 | 1975-06-19 | 1975-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-18 | 1979-06-19 | 1979-12-19 | $7700.00 | Window Closed / Lapsed |