US2838570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing pure halogeno methyl (p-hydroxy phenyl) ketones
Assignee: Takeda GmbH
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Filing: 1955-03-16
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Granted: 1958-06-10
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Expires: 1975-03-16
Abstract
No abstract record available.
Inventors
- 👤 Winterhalder Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:16
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/76; C07C49/82; C07C49/825; C07C45/00; C07C45/45; C07C45/46; C07C45/78; C07C45/79; C07C45/81
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
13 words
THE PROCESS OF SEPARATING A HALOGENO METHYL (PHYDROXY PHENYL) KETONE OF THE FORMULA
Claim 2
Dependent Claim
13 words
THE PROCESS OF SEPARATING A HALOGENO METHYL (PHYDROXY PHENYL) KETONE OF THE FORMULA
Claim 3
Dependent Claim
102 words
IN A PROCESS OF PRODUCING A HALOGENO METHYL (PHYDROXY PHENYL) KETONE, THE STEPS WHICH COMPRISE CONDENSING A PHENOL COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHENOL AND ANISOL WITH A HALOGENO ACETYL HALIDE IN THE PRESENCE OF A FRIEDEL-CRAFTS CONDENSATION CATALYST, SAID PHENOL COMPOUND BEIND DISSOLVED IN A HALOGENATED ALIPHATIC HYDROCARBON HAVING 1 TO 4 CARBON ATOMS IN ITS MOLECULE, THE HALOGEN OF SAID HALOGENATED ALIPHATIC HYDROCARBON BEING SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE, POURING THE REACTION MIXTURE INTO WATER, WHILE COOLING, AND SEPARATING THE RESULTING CRYSTALLIZED UNDISSOLVED HALOGENO METHYL (P-HYDROXY PHENYL) KETONE FROM THE AQUEOUS AND SOLVENT LAYERS.
Claim 4
Dependent Claim
102 words
IN A PROCESS OF PRODUCING A HALOGENO METHYL (PHYDROXY PHENYL) KETONE, THE STEPS WHICH COMPRISE CONDENSING A PHENOL COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHENOL AND ANISOL WITH A HALOGENO ACETYL HALIDE IN THE PRESENCE OF A FRIEDEL-CRAFTS CONDENSATION CATALYST, SAID PHENOL COMPOUND BEIND DISSOLVED IN A HALOGENATED ALIPHATIC HYDROCARBON HAVING 1 TO 4 CARBON ATOMS IN ITS MOLECULE, THE HALOGEN OF SAID HALOGENATED ALIPHATIC HYDROCARBON BEING SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE, POURING THE REACTION MIXTURE INTO WATER, WHILE COOLING, AND SEPARATING THE RESULTING CRYSTALLIZED UNDISSOLVED HALOGENO METHYL (P-HYDROXY PHENYL) KETONE FROM THE AQUEOUS AND SOLVENT LAYERS.
References Cited (Backward Citations)
US2487777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |