Patent US4001468A successfully refreshed from Google Patents.
US4001468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for coating sand cores and sand molds
Assignee: Ashland LLC
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Filing: 1975-08-13
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Granted: 1977-01-04
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Expires: 1995-08-13
Abstract
Abstract Disclosed is a method for reducing the amount of atmospheric moisture absorbed by foundry sand cores and molds. A wash coating composition is applied to the surfaces of foundry sand cores and molds. The coating comprises an organic liquid which can be chlorinated hydrocarbon, a suspending agent which can be clay, a vegetable gum or an amine-treated bentonite, a refractory powder which can be graphite, coke, mica, silica, alumina, magnesia, talc or zircon flour, and an organic polymer or copolymer, vinyl toluene/acrylate copolymer, styrene/acetylene copolymer, acrylate homopolymers and styrene/butadiene copolymers.
Inventors
- 👤 Michael J. Skubon
- 👤 John J. Spiwak
- 👤 Rodney L. Naro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:13
CPC Classifications
B; B22; B22C; B22C3/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
130 words
A method of reducing the amount of atmospheric moisture absorbed by a sand core or sand mold comprising coating the exposed surfaces of said mold or core with a wash comprising: a. an organic liquid solvent having a kauri-butanol value of at least 36; b. a suspending agent; c. powdered refractory material selected from the group consisting of graphite, coke, mica, silica, aluminum oxide, magnesium oxide, talc, and zircon flour; and d. an organic polymer selected from the group consisting of vinyl toluene/butadiene copolymer, styrene/butadiene copolymer, vinyl toluene/acrylate copolymer, styrene/acetylene copolymers, and acrylate homopolymers, the ratio by weight of organic polymer to organic liquid solvent being between about 1:50 and about 1:200 and the ratio by weight of powdered refractory to organic liquid solvent being between about 1:2.5 and 1:3.5.
Claim 2
Independent Claim
130 words
A method of reducing the amount of atmospheric moisture absorbed by a sand core or sand mold comprising coating the exposed surfaces of said mold or core with a wash comprising: a. an organic liquid solvent having a kauri-butanol value of at least 36; b. a suspending agent; c. powdered refractory material selected from the group consisting of graphite, coke, mica, silica, aluminum oxide, magnesium oxide, talc, and zircon flour; and d. an organic polymer selected from the group consisting of vinyl toluene/butadiene copolymer, styrene/butadiene copolymer, vinyl toluene/acrylate copolymer, styrene/acetylene copolymers, and acrylate homopolymers, the ratio by weight of organic polymer to organic liquid solvent being between about 1:50 and about 1:200 and the ratio by weight of powdered refractory to organic liquid solvent being between about 1:2.5 and 1:3.5.
Claim 3
Dependent Claim
56 words
The method of claim 1 wherein said organic liquid solvent is liquid 1,1,1-trichloroethane and said organic polymer is vinyl toluene/butadiene copolymer; the ratio by weight of vinyl toluene/butadiene copolymer to 1,1,1-trichloroethane being between about 1:50 and about 1:200 and the ratio by weight of said refractory to said 1,1,1-trichloroethane being between about 1:2.5 and about 1:3.5.
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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) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |