Patent EP0331774A1 successfully refreshed from Google Patents.
US4459376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin-coated sand for shell-molds and method for producing same
Assignee: Sumitomo Durez Co Ltd
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Filing: 1982-10-19
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Granted: 1984-07-10
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Expires: 2002-10-19
Abstract
Abstract A process for the preparation of a resin-coated sand for use in shell-molding operations wherein the molding operation is designed for metals such as aluminum, magnesium and their alloys which have a lower-melting temperature than iron. The process involves the coating of foundry sand with a phenolic resin incorporating a carbonate and/or bicarbonate of elements selected from groups Ia, IIa, IIIb, IVb, Vb, VIb, VIIb or VIII. This process produces a resin-coated sand with improved shake-out properties of the casting molds.
Inventors
- 👤 Noriaki Matsushima
- 👤 Yukio Saeki
- 👤 Yukio Tokunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:43
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/08; B; B22; B22C; B22C1/00; B22C1/02; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; C08K3/00; C08K3/18; C08K3/24; C08K3/26
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
63 words
A resin-coated foundry sand for shell-molding operations comprising coating foundry sand with a phenolic resin and a carbonate and/or bicarbonate of elements selected from groups Ia, IIa, IIIb, IVb, Vb, VIb, VIIb or VIII of the Periodic Table of Elements wherein the ratio of carbonate and/or bicarbonate to phenolic resin is about 0.5-50 parts by weight to 100 parts by weight phenolic resin.
Claim 2
Dependent Claim
63 words
A resin-coated foundry sand for shell-molding operations comprising coating foundry sand with a phenolic resin and a carbonate and/or bicarbonate of elements selected from groups Ia, IIa, IIIb, IVb, Vb, VIb, VIIb or VIII of the Periodic Table of Elements wherein the ratio of carbonate and/or bicarbonate to phenolic resin is about 0.5-50 parts by weight to 100 parts by weight phenolic resin.
Claim 3
Dependent Claim
15 words
Resin-coated sand according to claim 1, wherein the carbonate is cobalt carbonate or manganese carbonate.
Claim 4
Dependent Claim
12 words
Resin-coated sand according to claim 1, wherein the bicarbonate is sodium bicarbonate.
Claim 5
Dependent Claim
15 words
Resin-coated sand according to claim 1, wherein said phenolic resin is a novolac phenolic resin.
Claim 6
Dependent Claim
14 words
Resin-coated sand according to claim 1, wherein said phenolic resin is a resole resin.
Claim 7
Dependent Claim
19 words
Resin-coated sand according to claim 1, wherein said phenolic resin is a mixture of novolac and resole phenolic resins.
Claim 8
Dependent Claim
10 words
Resin-coated sand according to claim 1, further comprising a lubricant.
Claim 9
Dependent Claim
10 words
Resin-coated sand according to claim 4, further comprising a lubricant.
Claim 10
Dependent Claim
10 words
Resin-coated sand according to claim 5, further comprising a lubricant.
Claim 11
Dependent Claim
10 words
Resin-coated sand according to claim 6, further comprising a lubricant.
Claim 12
Independent Claim
69 words
A method for producing resin-coated sand for shell-molding operations having improved shake-out properties comprising coating foundry sand with phenolic resin and a carbonate and/or bicarbonate of elements selected from groups Ia, IIa, IIIb, IVb, Vb, VIb, VIIb or VIII of the Periodic Table of Elements wherein the ratio of carbonate and/or bicarbonate to phenolic resin is from about 0.5-50 parts by weight to 100 parts by weight phenolic resin.
Claim 13
Independent Claim
69 words
A method for producing resin-coated sand for shell-molding operations having improved shake-out properties comprising coating foundry sand with phenolic resin and a carbonate and/or bicarbonate of elements selected from groups Ia, IIa, IIIb, IVb, Vb, VIb, VIIb or VIII of the Periodic Table of Elements wherein the ratio of carbonate and/or bicarbonate to phenolic resin is from about 0.5-50 parts by weight to 100 parts by weight phenolic resin.
Claim 14
Dependent Claim
19 words
A method for producing resin-coated sand according to claim 11, wherein the carbonate is cobalt carbonate or manganese carbonate.
Claim 15
Dependent Claim
16 words
A method for producing resin-coated sand according to claim 11, wherein the bicarbonate is sodium bicarbonate.
Claim 16
Dependent Claim
19 words
A method for producing resin-coated sand according to claim 11, wherein the phenolic resin is a novolac phenolic resin.
Claim 17
Dependent Claim
19 words
A method for producing resin-coated sand according to claim 11, wherein the phenolic resin is a resole phenolic resin.
Claim 18
Dependent Claim
23 words
A method for producing resin-coated sand according to claim 11, wherein the phenolic resin is a mixture of novolac and resole phenolic resins.
Claim 19
Dependent Claim
14 words
A method for producing resin-coated sand according to claim 11, further comprising a lubricant.
Claim 20
Dependent Claim
14 words
A method for producing resin-coated sand according to claim 14, further comprising a lubricant.
Claim 21
Dependent Claim
14 words
A method for producing resin-coated sand according to claim 15, further comprising a lubricant.
Claim 22
Dependent Claim
14 words
A method for producing resin-coated sand according to claim 16, further comprising a lubricant.
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) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |