US2773908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation and purification of phloroglucinol
Assignee: Heyden Chemical Corp
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Filing: 1952-08-07
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Granted: 1956-12-11
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Expires: 1972-08-07
Abstract
No abstract record available.
Inventors
- 👤 William R Cake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:33
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/01; C07C37/055; C07C37/68; C07C37/70; C07C37/72
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
112 words
THE PROCESS OF SEPARATING PHLOROGLUCINOL FROM WATER-SOLUBLE CRUDE PHLOROGLUCINOL DIHYDRATE CONTAINING OTHER HYDROXY PHENOLS INCLUDING RESORCINOL EXTRACTED FROM A MASS OBTAINED BY FUSING 1,3,5-BENZENE TRIALKALI METAL SULFONATE WITH CAUSTIC ALKALI AND THEN ACIDIFYING THE FUSED PRODUCT WITH A MINERAL ACID, THE PROCESS COMPRISING DISSOLVING THE CRUDE PHLOROGLUCINOL DIHYDRATE IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF TOLUENE, XYLENE, MONOCHLOROBENZENE, ETHYL BENZENE, CUMENE, MESITYLENE, DICHLOROBENZENE, DIETHYLBENZENE, AND P-CYMENE, MAINTAINING THE RESULTING SOLUTION AT A TEMPERATURE OF FROM 110* C. TO 140* C. TO CONVERT THE PHLOROGLUCINOL DIHYDRATE TO INSOLUBLE ANHYDROUS PHLOROGLUCINOL WHEREBY ANHYDROUS PHLOROGLUCINOL CRYSTALS ARE FORMED, AND THEN SEPARATING THE CRYSTALS FROM THE HOT SOLUTION CONTAINING RESORCINOL DISSOLVED IN THE SOLVENT.
References Cited (Backward Citations)
US1912628A
Cited
US2579122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |