Patent US1563148A successfully refreshed from Google Patents.
Patent US2572141A successfully refreshed from Google Patents.
US2572141A
Expired / Lapsed
US
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Condensation of aldehydes
Assignee: California Spray Chemical Corp
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Filing: 1946-02-11
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Granted: 1951-10-23
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Expires: 1966-02-11
Abstract
No abstract record available.
Inventors
- 👤 Leonard W Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:59
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/20; C07C41/00; C07C41/01; C07C41/18; C07C41/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A CONDENSATION REACTION INVOLVING THE REACTION OF AN ALDEHYDE AND AN AROMATIC COMPOUND POSSESSIN AN ACTIVE RING HYDROGEN ATOM AND CONTAINING AT LEAST ONE RADICAL -OR'', IN WHICH R'' IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND AN ALKYL RADICAL, WHICH COMPRISES DISSOLVING SAID REACTANTS IN A MUTUAL WATER-IMMISCIBLE SOLVENT, SUBJECTING THE RESULTING SOLUTION TO REFLUX DISTILLATION IN THE PRESENCE OF 1-5% BY WEIGHT BASED ON THE TOTAL REACTANTS OF A CATALYST COMPRISING A FINELY-DIVIDED UNREACTIVE ABSORPTIVE SOLID IMPREGNATED WITH SULFURIC ACID AND PREVENTING THE RETURN OF CONDENSED WATER TO THE REACTION SYSTEM.
Claim 2
Dependent Claim
94 words
A CONDENSATION REACTION INVOLVING THE REACTION OF AN ALDEHYDE AND AN AROMATIC COMPOUND POSSESSIN AN ACTIVE RING HYDROGEN ATOM AND CONTAINING AT LEAST ONE RADICAL -OR'', IN WHICH R'' IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND AN ALKYL RADICAL, WHICH COMPRISES DISSOLVING SAID REACTANTS IN A MUTUAL WATER-IMMISCIBLE SOLVENT, SUBJECTING THE RESULTING SOLUTION TO REFLUX DISTILLATION IN THE PRESENCE OF 1-5% BY WEIGHT BASED ON THE TOTAL REACTANTS OF A CATALYST COMPRISING A FINELY-DIVIDED UNREACTIVE ABSORPTIVE SOLID IMPREGNATED WITH SULFURIC ACID AND PREVENTING THE RETURN OF CONDENSED WATER TO THE REACTION SYSTEM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |