Patent US3734936A successfully refreshed from Google Patents.
US3734936A
Expired / Lapsed
US
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Process of producing a foundry core composition
Assignee: Qo Chemicals Inc
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Filing: 1971-02-03
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Granted: 1973-05-22
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Expires: 1991-02-03
Abstract
Abstract A FOUNDRY CORE COMPOSITION WHICH IS THE PRODUCT OF THE PROCESS WHICH COMPRISES: (A) FORMING A MONOMERIC BINDER MIXTURE OF SPECIFIED AMOUNTS OF AQUEOUS UREAFORMALDEHYDE MIXTURE, FURFURYL ALCOHOL, AND A SILIANE COUPLING AGENT OF THE GENERAL FORMULA: X-R''SI-(OR")3 WHEREIN R'' IS A SHORT CHAIN ALKYLENE RADIAL, R" IS ARYL, ALKYL, SUBSTITUTED ARYL, OR FURFURYL, AND X IS AMINO, MERCAPTO, EPOXY, OR GLYCIDOXY, (B) FORMING A MIXTURE OF SPECIFIED AMOUNTS OF SAND AND ACIDIC CATALYST, AND (C) ADMIXING SPECIFIED AMOUNTS OF THE MONOMERIC BINDER WITH SPECIFIED AMOUNTS OF THE SAND-ACIDIC CATALYST MIXTURE.
Inventors
- 👤 L Brown
- 👤 D Eftax
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:26
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/205; C; C08; C08K; C08K5/00; C08K5/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |