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Patent US4381813A successfully refreshed from Google Patents.
US4381813A
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Method for manufacturing foundry cores
Assignee: Qo Chemicals Inc
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Filing: 1981-09-10
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Granted: 1983-05-03
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Expires: 2001-09-10
Abstract
Abstract In-situ formation of metal sulfonate curing agents for foundry sand binders.
Inventors
- 👤 Roger H. Kottke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:06
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
A method of preparing a foundry core which comprises the steps of mixing with a neutral or acidic core sand an aromatic or aliphatic sulfonic acid and a metal compound reactable at substantially ambient temperature with said sulfonic acid to form a latent metal sulfonate catalyst for curable binders and then mixing with the treated core sand a curable binder, forming said treated core sand and binder into a desired shape and heating to cure said binder to produce said sand core.
Claim 2
Independent Claim
82 words
A method of preparing a foundry core which comprises the steps of mixing with a neutral or acidic core sand an aromatic or aliphatic sulfonic acid and a metal compound reactable at substantially ambient temperature with said sulfonic acid to form a latent metal sulfonate catalyst for curable binders and then mixing with the treated core sand a curable binder, forming said treated core sand and binder into a desired shape and heating to cure said binder to produce said sand core.
Claim 3
Dependent Claim
18 words
A method according to claim 1 wherein the metal compound reactable with sulfonic acid is a metal carbonate.
Claim 4
Dependent Claim
17 words
A method according to claim 1 wherein the metal compound reactable with sulfonic acid is copper carbonate.
Claim 5
Dependent Claim
14 words
A method according to claim 1 wherein the curable binder is a furan resin.
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) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |