Patent US2745816A successfully refreshed from Google Patents.
US2745816A
Expired / Lapsed
US
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Novolak from phenol and furfural reacted in alkaline medium
Assignee: Hartford National Bank and Trust Co
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Filing: 1951-11-23
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Granted: 1956-05-15
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Expires: 1971-11-23
Abstract
No abstract record available.
Inventors
- 👤 Dijkstra Rinse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:07
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
77 words
A METHOD OF PREPARING A RESIN-LIKE PRODUCT OF THE PERMANENTLY FUSIBLE TYPE WHICH COMPRISES THE STEPS, MIXING FURFURAL, A MONOCHYDRIC PHENOL, AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND UNSUBSTITUTED PRIMARY MONOAMINES IN A MOLECULAR RATIO OF 1.1:1:0.12 TO 0.2; ADDING TO SAID MIXTURE AS A CATALYST AN ALKALINE EARTH HYDROXIDE; AND HEATING SAID MIXTURE UNTIL AT LEAST 0.7 MOL. OF WATER HAS BEEN DISTILLED OFF FOR EACH MOLECULE OF PHENOL WHICH HAS REACTED.
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) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |