Patent US3290391A successfully refreshed from Google Patents.
US3290391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production and purification of a diphenylolpropane
Assignee: Hooker Chemical Corp
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Filing: 1962-12-31
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Granted: 1966-12-06
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Expires: 1982-12-31
Abstract
No abstract record available.
Inventors
- 👤 Walter H Prahl
- 👤 Sol J Lederman
- 👤 Ellis I Lichtblau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:21
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/74; C07C37/76; C07C37/11; C07C37/14; C07C37/72; C07C37/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PROCESS FOR THE RECOVERY OF A PURIFIED 2,2-(4,4''DIHYDROXYDIPHENYL) PROPANE FROM ITS CRUDE REACTION PRODUCT PRODUCED BY THE CONDENSATION OF PHENOL WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF PROPADIENE, PROPYNE, AND MIXTURES THEREOF, INCLUDING THE STEPS OF (1) REMOVING THE MORE VOLATILE MATERIALS FROM THE 2,2-(4,4''DIHYDROXYDIPHENYL) PROPANE, (2) VACUUM DISTILLING THE 2,2-(4,4''-DIHYDROXYDIPHENYL) PROPANE FROM MATERIALS LESS VOLATILE IN IT, AND (3) SEPARATING THE DISTILLED 2,2-(4,4''DIHYDROXYDIPHENYL) PROPANE FROM ITS IMPURITIES WITH A SOLVENT SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUENE, XYLENE, METHYLENE CHLORIDE, ETHYLENE DICHLORIDE, AND TRICHLOROETHYLENE WHEREBY SUBSTANTIALLY PUR 2,2-(4,4''DIHYDROXYDIPHENYL) PROPANE AND A SOLVENT SOLUTION OF SEPARATED IMPURITIES ARE PRODUCED.
Claim 2
Dependent Claim
103 words
A PROCESS FOR THE RECOVERY OF A PURIFIED 2,2-(4,4''DIHYDROXYDIPHENYL) PROPANE FROM ITS CRUDE REACTION PRODUCT PRODUCED BY THE CONDENSATION OF PHENOL WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF PROPADIENE, PROPYNE, AND MIXTURES THEREOF, INCLUDING THE STEPS OF (1) REMOVING THE MORE VOLATILE MATERIALS FROM THE 2,2-(4,4''DIHYDROXYDIPHENYL) PROPANE, (2) VACUUM DISTILLING THE 2,2-(4,4''-DIHYDROXYDIPHENYL) PROPANE FROM MATERIALS LESS VOLATILE IN IT, AND (3) SEPARATING THE DISTILLED 2,2-(4,4''DIHYDROXYDIPHENYL) PROPANE FROM ITS IMPURITIES WITH A SOLVENT SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUENE, XYLENE, METHYLENE CHLORIDE, ETHYLENE DICHLORIDE, AND TRICHLOROETHYLENE WHEREBY SUBSTANTIALLY PUR 2,2-(4,4''DIHYDROXYDIPHENYL) PROPANE AND A SOLVENT SOLUTION OF SEPARATED IMPURITIES ARE PRODUCED.
References Cited (Backward Citations)
US2884462A
Cited
US3073868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |