Patent US2811508A successfully refreshed from Google Patents.
US2811508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation of phenol and aldehyde with trichloroacetic acid and production of phenolaldehyde resin free of acid catalyst
Assignee: Honeywell International Inc
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Filing: 1955-09-22
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Granted: 1957-10-29
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Expires: 1975-09-22
Abstract
No abstract record available.
Inventors
- 👤 Werner E Kleinicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:20
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A PROCESS FOR THE MANUFACTURE OF PHENOL-ALDEHYDE RESINS WHICH COMPRISES HEATING A MIXTURE OF A PHENOL SELECTED FROM THE GROUP CONSISTING OF PHENOL, ALKYL PHENOL ARYL PHENOL, ARALKYL PHENOL AND ALKARYL PHENOL AND AN ALDEHYDE IN THE PRESENCE OF SMALL AMOUNT OF TRICHLOROACETIC ACID AS A CATALYST TO A TEMPERATURE BELOW ABOUT 90*C. FOR A SUFFICIENT LENGTH OF TIME TO EFFECT CONDENSATION OF THE PHENOL AND ALDEHYDE AND REDUCE THE AMOUNT OF FREE ALDEHYDE TO LESS THAN 4%, MAINTAINING A WATER CONCENTRATION OF AT LEAST 15% BY WEIGHT IN THE RECTION MASS AND HEATING THE REACTION MASS TO A TEMPERATURE ABOVE 100*C. FOR A SUFFICIENT LENGTH OF TIME TO EFFECT DECOMPOSITION OF THE TRICHLOROACETIC ACID INTO CHLOROFORM AND CARBON DIOXIDE, AND DEHYDRATING THE REACTION MASS.
Claim 2
Dependent Claim
125 words
A PROCESS FOR THE MANUFACTURE OF PHENOL-ALDEHYDE RESINS WHICH COMPRISES HEATING A MIXTURE OF A PHENOL SELECTED FROM THE GROUP CONSISTING OF PHENOL, ALKYL PHENOL ARYL PHENOL, ARALKYL PHENOL AND ALKARYL PHENOL AND AN ALDEHYDE IN THE PRESENCE OF SMALL AMOUNT OF TRICHLOROACETIC ACID AS A CATALYST TO A TEMPERATURE BELOW ABOUT 90*C. FOR A SUFFICIENT LENGTH OF TIME TO EFFECT CONDENSATION OF THE PHENOL AND ALDEHYDE AND REDUCE THE AMOUNT OF FREE ALDEHYDE TO LESS THAN 4%, MAINTAINING A WATER CONCENTRATION OF AT LEAST 15% BY WEIGHT IN THE RECTION MASS AND HEATING THE REACTION MASS TO A TEMPERATURE ABOVE 100*C. FOR A SUFFICIENT LENGTH OF TIME TO EFFECT DECOMPOSITION OF THE TRICHLOROACETIC ACID INTO CHLOROFORM AND CARBON DIOXIDE, AND DEHYDRATING THE REACTION MASS.
References Cited (Backward Citations)
US1846853A
Cited
GB481069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |