Patent US2840542A successfully refreshed from Google Patents.
US2840542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etherified phenolic resins
Assignee: Westinghouse Electric Corp
•
Filing: 1955-01-28
•
Granted: 1958-06-24
•
Expires: 1975-01-28
Abstract
No abstract record available.
Inventors
- 👤 James H Freeman
- 👤 Leonard E Edelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:06
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28; C08G8/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
THE PROCESS WHICH COMPRISES ESTABLISHING A MIXTURE OF METHYLOLPHENOL COMPOUNDS IN WHICH THE RATIO OF METHYLOL GROUPS TO PHENOLIC NUCLEI IS WITHIN THE RANGE OF FROM 1.0 TO 1.5, ETHERIFYING THE PHENLIC HYDROXYL GROUPS ON THE METHYLOLPHENOL COMPOUNDS, AND AZEOTROPICALLY DISTILLING THE ETHERIFIED METHYLOLPHENEL COMPOUNDS IN AN ANHYDROUS, NON-ALCOHOLIC, WATER-IMMISCIBLE SOLVENT THEREFOR IN THE PRESENCE OF AN ACID EMPLOYED IN AN AMOUNT AND CONCENTRATION SUFFICIENT TO MAINTAIN THE SOLUTION AT A PH NO GREATER THAN 4, WHEN MEASURED IN AN EQUAL PARTS MIXTURE WITH WATER, TO CAUSE METHYLOL GROUPS ON CERTAIN OF THE ETHERIFIED METHYLOLPHENOL COMPOUNDS TO REACT WITH HYDROGEN ATOMS LOCATED ON OTHER ETHERIFIED METHYLOLPHENOL COMPOUNDS IN POSITIONS ORTHO AND PARA TO THE ETHERIFIED HYDROXYL GROUP TO PRODUCE A RESIN OF METYYLENE BRIDGED PHENOL UNITS IN WHICH A PREDETERMINED NUMBER OF THE PHENOLIC HYDROXYL GROUPS HAVE BEEN CONVERTED TO ETHER GROUPS.
Claim 2
Dependent Claim
142 words
THE PROCESS WHICH COMPRISES ESTABLISHING A MIXTURE OF METHYLOLPHENOL COMPOUNDS IN WHICH THE RATIO OF METHYLOL GROUPS TO PHENOLIC NUCLEI IS WITHIN THE RANGE OF FROM 1.0 TO 1.5, ETHERIFYING THE PHENLIC HYDROXYL GROUPS ON THE METHYLOLPHENOL COMPOUNDS, AND AZEOTROPICALLY DISTILLING THE ETHERIFIED METHYLOLPHENEL COMPOUNDS IN AN ANHYDROUS, NON-ALCOHOLIC, WATER-IMMISCIBLE SOLVENT THEREFOR IN THE PRESENCE OF AN ACID EMPLOYED IN AN AMOUNT AND CONCENTRATION SUFFICIENT TO MAINTAIN THE SOLUTION AT A PH NO GREATER THAN 4, WHEN MEASURED IN AN EQUAL PARTS MIXTURE WITH WATER, TO CAUSE METHYLOL GROUPS ON CERTAIN OF THE ETHERIFIED METHYLOLPHENOL COMPOUNDS TO REACT WITH HYDROGEN ATOMS LOCATED ON OTHER ETHERIFIED METHYLOLPHENOL COMPOUNDS IN POSITIONS ORTHO AND PARA TO THE ETHERIFIED HYDROXYL GROUP TO PRODUCE A RESIN OF METYYLENE BRIDGED PHENOL UNITS IN WHICH A PREDETERMINED NUMBER OF THE PHENOLIC HYDROXYL GROUPS HAVE BEEN CONVERTED TO ETHER GROUPS.
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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |