Patent US3640932A successfully refreshed from Google Patents.
US3640932A
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Compositions for sand core mold elements
Assignee: Monsanto Co
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Filing: 1968-10-21
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Granted: 1972-02-08
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Expires: 1988-10-21
Abstract
Abstract FOUNDRY SAND CORE MOLD ELEMENTS HAVING IMPROVED STRUCTURAL CHARACTERISTICS ARE MADE BY COMPOSITING SAND WITH A WATER SOLUBLE SULFONATED RESOLE RESIN COMPOSITION.
Inventors
- 👤 Joel M Schnur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:54
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1315; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/18; C08G8/24
Claims Analysis
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |