US3943089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick-hardening core and molding sand composition, and a method for its hardening
Assignee: Lukasiewicz Research Network - Krakow Institute of Technology
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Filing: 1974-05-24
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Granted: 1976-03-09
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Expires: 1994-05-24
Abstract
Abstract A quick-setting core and molding sand comprising quartz sand, a binder and an adsorbent or absorbent. The binder is a solution of a binding agent such as polystyrene, polyvinyl acetate or the like in an appropriate organic solvent. After molding, the sand is hardened by means of blowing it with an inert gas, preferably air or applying a suction thereto. The time of hardening is very short and depends upon the size of a mold or a core which is being made.
Inventors
- 👤 Jan Harpula
- 👤 Jur Piszak
- 👤 Mieczyslaw Debski
- 👤 Tadeusz Rzepa
- 👤 Jerzy Sliwa
- 👤 Andrzej Heryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:24
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
76 words
A quick-hardening core and molding sand composition comprising quartz sand and a binder solution, said binder solution comprising a binding agent of molecular weight of 100,000-350,000 selected from the group consisting of polystyrene, polyvinyl acetate, polymethylmethacrylate, polyethyl-methacrylate, derivatives of cellulose, and mixtures thereof, and an organic solvent for the binding agent selected from the group consisting of aliphatic and aromatic hydrocarbons, said binding agent being present in said solution in a concentration of 10 to 65%.
Claim 2
Dependent Claim
76 words
A quick-hardening core and molding sand composition comprising quartz sand and a binder solution, said binder solution comprising a binding agent of molecular weight of 100,000-350,000 selected from the group consisting of polystyrene, polyvinyl acetate, polymethylmethacrylate, polyethyl-methacrylate, derivatives of cellulose, and mixtures thereof, and an organic solvent for the binding agent selected from the group consisting of aliphatic and aromatic hydrocarbons, said binding agent being present in said solution in a concentration of 10 to 65%.
Claim 3
Dependent Claim
44 words
A sand composition as claimed in claim 1 wherein the binding agent is present in the amount of 0.1-10 parts by weight and the organic solvent is present in the amount of 0.1-10 parts by weight, per 100 parts by weight of the sand.
Claim 4
Dependent Claim
33 words
A sand composition as claimed in claim 2 further containing at least one absorbent or adsorbent in a maximum amount of 10 parts by weight per 100 parts by weight of the sand.
Claim 5
Dependent Claim
34 words
A sand composition as claimed in claim 2 further containing a powdered material of high specific surface, in an amount not greater than 1 part by weight per 100 parts by weight of sand.
Claim 6
Dependent Claim
21 words
A sand composition as claimed in claim 4 wherein said powdered material is coal dust, a metal oxide, or aluminum powder.
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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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |