Patent US3290390A successfully refreshed from Google Patents.
US3290390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of bisphenol from resinous by-products
Assignee: Hooker Chemical Corp
•
Filing: 1962-12-31
•
Granted: 1966-12-06
•
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
2026-11-02 13:57
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/74; C07C37/11; C07C37/20; C07C37/48; C07C37/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
THE PROCESS WHICH INCLUDES THE STEPS OF (1) REACTING PHENOL AND ACETONE IN THE PRESENCE OF A ACIDIC CONDENSING AGENT TO PRODUCE A REACTION PRODUCT COMPRISING 2,2-(4,4'' - DIHYDROXYDIPHENYL)PROPANE, (2) DISTILLING THE MORE VOLATILE MATERIALS FROM THE 2,2-(4,4''-DIHYDROXYDIPHENYL)PROPANE, (3) VACUUM DISTILLING THE RESULTING 2,2(4,4''-DIHYDROXYDIPHENYL)PROPANE FROM MATERIALS LESS VOLATILE IN IT, TO OBTAIN A DISTILLATE OF 2,2-(4,4''-DIHYDROXYDIPHENYL)PROPANE AND A RESINOUS BY-PRODUCT MATERIAL, (4) SEPARATING THE SAID RESINOUS BY-PRODUCT MATERIAL FROM THE DISTILLED 2,2-(4,4''-DIHYDROXYDIPHENYL) PROPANE BY MEANS OF A SOLVENT SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUENE, XYLENE, METHYLENE CHLORIDE, ETHYLENE DICHLORIDE, AND TRICHLOROETHYLENE, WHEREBY SUBSTANTIALLY PURE 2,2(4''4''-DIHYDOXYDIPHENYL) PROPANE AND A SOLVENT SOLUTION OF RESINOUS BY-PRODUCT MATERIAL ARE PRODUCED, (5) REMOVING SUBSTANTIALLY ALL THE SOLVENT FROM THE SAID RESINOUS BY-PRODUCT MATERIAL (6) SEPARATELY TREATING THE RESULTANT RESINOUS BY-PRODUCT MATERIAL WITH PHENOL IN THE PRESENCE OF AN ACIDIC CONDENSING AGENT AT AN ELEVATED TEMPERATURE BETWEEN ABOUT ROOM TEMPERATURE TO ABOUT 150 DEGREES CENTRIGRADE TO PRODUCE A REACTION PRODUCT COMPRISING ADDITIONAL 2,2-(4,4''-DIHYDROXYDIPHENYL)PROPANE, AND (7) RECOVERING THE 2,2-(4,4''-DIHYDROXYDIPHENYL)PROPANE PRODUCED IN STEP (6).
Claim 2
Dependent Claim
168 words
THE PROCESS WHICH INCLUDES THE STEPS OF (1) REACTING PHENOL AND ACETONE IN THE PRESENCE OF A ACIDIC CONDENSING AGENT TO PRODUCE A REACTION PRODUCT COMPRISING 2,2-(4,4'' - DIHYDROXYDIPHENYL)PROPANE, (2) DISTILLING THE MORE VOLATILE MATERIALS FROM THE 2,2-(4,4''-DIHYDROXYDIPHENYL)PROPANE, (3) VACUUM DISTILLING THE RESULTING 2,2(4,4''-DIHYDROXYDIPHENYL)PROPANE FROM MATERIALS LESS VOLATILE IN IT, TO OBTAIN A DISTILLATE OF 2,2-(4,4''-DIHYDROXYDIPHENYL)PROPANE AND A RESINOUS BY-PRODUCT MATERIAL, (4) SEPARATING THE SAID RESINOUS BY-PRODUCT MATERIAL FROM THE DISTILLED 2,2-(4,4''-DIHYDROXYDIPHENYL) PROPANE BY MEANS OF A SOLVENT SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUENE, XYLENE, METHYLENE CHLORIDE, ETHYLENE DICHLORIDE, AND TRICHLOROETHYLENE, WHEREBY SUBSTANTIALLY PURE 2,2(4''4''-DIHYDOXYDIPHENYL) PROPANE AND A SOLVENT SOLUTION OF RESINOUS BY-PRODUCT MATERIAL ARE PRODUCED, (5) REMOVING SUBSTANTIALLY ALL THE SOLVENT FROM THE SAID RESINOUS BY-PRODUCT MATERIAL (6) SEPARATELY TREATING THE RESULTANT RESINOUS BY-PRODUCT MATERIAL WITH PHENOL IN THE PRESENCE OF AN ACIDIC CONDENSING AGENT AT AN ELEVATED TEMPERATURE BETWEEN ABOUT ROOM TEMPERATURE TO ABOUT 150 DEGREES CENTRIGRADE TO PRODUCE A REACTION PRODUCT COMPRISING ADDITIONAL 2,2-(4,4''-DIHYDROXYDIPHENYL)PROPANE, AND (7) RECOVERING THE 2,2-(4,4''-DIHYDROXYDIPHENYL)PROPANE PRODUCED IN STEP (6).
References Cited (Backward Citations)
US2791616A
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 |