US3666706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substitute for coal dust in casting molds as lustrous carbon-forming additive
Assignee: RAVENSBERGER EISENHUTTE REINSH
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Filing: 1969-11-06
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Granted: 1972-05-30
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Expires: 1989-11-06
Abstract
Abstract A non-foamed, unsubstituted hydrocarbon polymer in finely divided form, of particle size less than 0.3 mm in amounts of 0.5 to 3 percent provides the lustrous or glance carbon forming constituent in place of coal dusts in a foundry molding sand composition with 6 to 8 percent bentonite as binder.
Inventors
- 👤 Winfried Hespers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:56
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
17 words
The composition as described in claim 1 wherein said synthetic plastic material is comprised of a polystyrene.
Claim 2
Dependent Claim
19 words
A composition as described in claim 1 wherein said synthetic plastic material is a bead product of bead polymerization.
Claim 3
Dependent Claim
16 words
A composition as described in claim 3 wherein the polymer beads are coated with colloidal bentonite.
Claim 4
Dependent Claim
20 words
The composition as described in claim 1 with said synthetic plastic material added in the form of a water emulsion.
Claim 5
Dependent Claim
27 words
The composition as described in claim 5 wherein the synthetic plastic material amounts to from about 0.5 percent to about 2 percent in the molding sand mixture.
Claim 6
Dependent Claim
27 words
The composition as described in claim 1 wherein the synthetic plastic material amounts to from about 0.5 percent to about 3 percent in the molding sand mixture.
Claim 7
Dependent Claim
35 words
The composition as described in claim 1 with said synthetic plastic material added in a fine grained or pulverulant form with size of 0.2 mm and less with an average grain size of 0.15 mm.
Claim 8
Dependent Claim
21 words
The composition as described in claim 1, wherein said synthetic plastic material has an average particle size smaller than 0.3 mm.
Claim 9
Dependent Claim
40 words
A foundry sand mold finishing composition, consisting essentially of, by weight, about 2.4 percent bentonite, about 31 percent polystyrene of an average grain size less than 0.02 mm, and the balance water as a carrier; the polystyrene emulsified in water.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |