Patent US2915491A successfully refreshed from Google Patents.
US2915491A
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Phenolic resins and their use in moulding processes
Assignee: Monsanto Chemicals Ltd
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Filing: 1956-04-30
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Granted: 1959-12-01
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Expires: 1976-04-30
Abstract
No abstract record available.
Inventors
- 👤 Smith Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:42
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/346; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; C08G; C08G14/00; C08G14/02; C08G14/04; C08G14/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A COMPOSITION FOR USE IN THE SHELL-MOULDING PROCESS CONSISTING OF A DRY MIXTURE OF A FINELY DIVIDED REFRACTORY MATERIAL TAKEN FROM THE GROUP CONSISTING OF SAND, SILLIMANITE AND FIRE CLAY AND FROM 5 TO 15% BY WEIGHT OF A PHENOLIC RESIN PREPARED BY CONDENSING ONE MOL OF PHENOL WITH FROM 1.3 TO 1.5 MOLS OF FORMALDEHYDE IN AN AQUEOUS MEDIUM IN THE PRESENCE OF 0.05-0.35 MOL OF AMMONIA UNDER CONTROLLED EXOTHERMAL CONDITIONS AND THEN FURTHER HEATING THE REACTION MIXTURE UNTIL ON COOLING THE PRECIPITATED LIQUID RESIN SOLIDIFIES.
Claim 2
Dependent Claim
87 words
A COMPOSITION FOR USE IN THE SHELL-MOULDING PROCESS CONSISTING OF A DRY MIXTURE OF A FINELY DIVIDED REFRACTORY MATERIAL TAKEN FROM THE GROUP CONSISTING OF SAND, SILLIMANITE AND FIRE CLAY AND FROM 5 TO 15% BY WEIGHT OF A PHENOLIC RESIN PREPARED BY CONDENSING ONE MOL OF PHENOL WITH FROM 1.3 TO 1.5 MOLS OF FORMALDEHYDE IN AN AQUEOUS MEDIUM IN THE PRESENCE OF 0.05-0.35 MOL OF AMMONIA UNDER CONTROLLED EXOTHERMAL CONDITIONS AND THEN FURTHER HEATING THE REACTION MIXTURE UNTIL ON COOLING THE PRECIPITATED LIQUID RESIN SOLIDIFIES.
References Cited (Backward Citations)
US1126926A
Cited
US2452420A
Cited
US2521614A
Cited
US2623865A
Cited
GB735564A
Cited
US2683296A
Cited
US2807556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |