US4445565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing cores and molds
Assignee: Applied Industrial Materials Corp
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Filing: 1983-07-11
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Granted: 1984-05-01
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Expires: 2003-07-11
Abstract
Abstract A combination binder and hardener therefor for a foundry aggregate wherein a linear metal polyphosphate or ammonium polyphosphate is used as the binder, the hardener is a mixture of phosphoric acid and a source of polyvalent metal cations.
Inventors
- 👤 Charles E. Seeney
- 👤 John F. Kraemer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:34
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/18; B22C1/185
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
An improved process for preparing foundry cores and molds from a foundry aggregate, and a binder and hardener therefor comprising the steps of (a) mixing the aggregate with a metal polyphosphate, or an ammonium polyphosphate, thereby coating the aggregate, (b) mixing the coated aggregate with a hardener comprising a source of polyvalent cations and orthophosphoric acid, and (c) packing the aggregate and binder therefor into a core box or mold box for a length of time sufficient for the binder to cure and thereby form the core or mold.
Claim 2
Dependent Claim
89 words
An improved process for preparing foundry cores and molds from a foundry aggregate, and a binder and hardener therefor comprising the steps of (a) mixing the aggregate with a metal polyphosphate, or an ammonium polyphosphate, thereby coating the aggregate, (b) mixing the coated aggregate with a hardener comprising a source of polyvalent cations and orthophosphoric acid, and (c) packing the aggregate and binder therefor into a core box or mold box for a length of time sufficient for the binder to cure and thereby form the core or mold.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the polyphosphate is potassium polyphosphate.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein the polyphosphate is ammonium polyphosphate.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the polyphosphate is zinc polyphosphate.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the hardener is a mixture of a polyvalent metal compound and phosphoric acid.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein the phosphoric acid and the hardener are provided by black or green wet process phosphoric acid.
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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |