US3645937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foundry sand compositions containing graft copolymers of acrylic acid with water-soluble polyhydroxy polymeric compounds
Assignee: Applied Industrial Materials Corp
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Filing: 1968-09-04
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Granted: 1972-02-29
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Expires: 1988-09-04
Abstract
Abstract A SAND CORE AND MOLD COMPOSITION FOR USE IN CASTING METALS COMPRISING FOUNDRY SAND, CLAY, WATER AND FROM ABOUT 0.0025% TO ABOUT 1% BY WEIGHT OF A WATER-SOLUBLE GRAFT COPOLYMER OF ACRYLIC ACID AND A MINOR AMOUNT OF A WATER-SOLUBLE POLYHYDROXY POLYMERIC COMPOUND, INCLUDING WATER-SOLUBLE SALTS THEREOF.
Inventors
- 👤 William J Lang
- 👤 John J Krajewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:10
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1305; B; B22; B22C; B22C1/00; B22C1/16; B22C1/167; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |