Patent US2485519A successfully refreshed from Google Patents.
Patent US2834755A successfully refreshed from Google Patents.
US2834755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenolic liquid resins
Assignee: Monsanto Chemicals Ltd
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Filing: 1955-11-09
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Granted: 1958-05-13
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Expires: 1975-11-09
Abstract
No abstract record available.
Inventors
- 👤 Louis M Higashi
- 👤 Reino A Jarvi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:07
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A PROCESS FOR PREPARING A LIQUID PHENOLIC RESIN WHICH COMPRISES: (1) CONDENSING 1 MOL OF A MONOHYDRIC PHENOL WITH FROM 0.8-3 MOLS OF PARAFORMALDEHYDE IN THE PRESENCE OF 0.01-0.1 MOL OF A CATALYST TAKEN FROM THE GROUP CONSISTING OF BARIUM OXIDE, BARIUM HYDROXIDE, BARIUM HYDROXIDE OCTAHYDRATE, AND BARIUM CARBONATE, AND IN THE PRESENT OF 0.02 TO 1 MOL OF WATER SAID CONDENSATION REACTION BEING MAINTAINED AT A TEMPERATURE OF 30 TO 60*C. UNTIL THE PARAFORMALDEHYDE IS DISSOLVED AND THEN CONTINUED AT 65 TO 75*C. UNDER REFLUX AT REDUCED PRESSURE UNTIL THE FREE FORMALDEHYDE CONTENT IS LESS THAN 5% BY WEIGHT, (2) THEREAFTER COOLING THE REACTION MEDIUM TO LESS THAN 30*C., (3) NEUTRALIZING THE COOLED REACTION MEDIUM WITH ORTHOPHOSPHORIC ACID TO A PH OF 6.0-7.5, (4) DILUTING THE NEUTRALIZED MEDIUM WITH COOL WATER TO LESS THAN 50* SOLIDS BY WEIGHT, WHEREBY A CRYSTALLINE PRECIPITATE IS OBTAINED AND (5) FILTERING THE REACTION MEDIUM.
Claim 2
Dependent Claim
151 words
A PROCESS FOR PREPARING A LIQUID PHENOLIC RESIN WHICH COMPRISES: (1) CONDENSING 1 MOL OF A MONOHYDRIC PHENOL WITH FROM 0.8-3 MOLS OF PARAFORMALDEHYDE IN THE PRESENCE OF 0.01-0.1 MOL OF A CATALYST TAKEN FROM THE GROUP CONSISTING OF BARIUM OXIDE, BARIUM HYDROXIDE, BARIUM HYDROXIDE OCTAHYDRATE, AND BARIUM CARBONATE, AND IN THE PRESENT OF 0.02 TO 1 MOL OF WATER SAID CONDENSATION REACTION BEING MAINTAINED AT A TEMPERATURE OF 30 TO 60*C. UNTIL THE PARAFORMALDEHYDE IS DISSOLVED AND THEN CONTINUED AT 65 TO 75*C. UNDER REFLUX AT REDUCED PRESSURE UNTIL THE FREE FORMALDEHYDE CONTENT IS LESS THAN 5% BY WEIGHT, (2) THEREAFTER COOLING THE REACTION MEDIUM TO LESS THAN 30*C., (3) NEUTRALIZING THE COOLED REACTION MEDIUM WITH ORTHOPHOSPHORIC ACID TO A PH OF 6.0-7.5, (4) DILUTING THE NEUTRALIZED MEDIUM WITH COOL WATER TO LESS THAN 50* SOLIDS BY WEIGHT, WHEREBY A CRYSTALLINE PRECIPITATE IS OBTAINED AND (5) FILTERING THE REACTION MEDIUM.
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) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |