US4078599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-curing and water-soluble mold
Assignee: National Institute for Materials Science
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Filing: 1977-02-17
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Granted: 1978-03-14
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Expires: 1997-02-17
Abstract
Abstract A process for producing a self-curable and water-soluble mold, which comprises admixing a suitable amount of water with a mixture consisting of (A) 100 parts by weight of refractory sand particles composed of alumina, (B) 1 to 5 parts by weight of at least one alkali metal phosphate selected from the group consisting of potassium phosphate and sodium phosphate, and (C) 0.2 to 3 parts by weight of an aluminum powder; shaping the resulting mixture into a mold of the desired form; and then allowing the mold to cure spontaneously.
Inventors
- 👤 Toshisada Makiguchi
- 👤 Akira Muramatsu
- 👤 Hyojiro Kurabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:21
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/02; B22C1/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A process for producing a self-curable and water-soluble mold, which comprises admixing a suitable amount of water with a mixture consisting of (A) 100 parts by weight of refractory sand particles composed of alumina, (B) 1 to 5 parts by weight of at least one alkali metal phosphate selected from the group consisting of potassium phosphate and sodium phosphate, and (C) 0.2 to 3 parts by weight of an aluminum powder; shaping the resulting mixture into a mold of the desired form; and then allowing the mold to cure spontaneously.
Claim 2
Dependent Claim
90 words
A process for producing a self-curable and water-soluble mold, which comprises admixing a suitable amount of water with a mixture consisting of (A) 100 parts by weight of refractory sand particles composed of alumina, (B) 1 to 5 parts by weight of at least one alkali metal phosphate selected from the group consisting of potassium phosphate and sodium phosphate, and (C) 0.2 to 3 parts by weight of an aluminum powder; shaping the resulting mixture into a mold of the desired form; and then allowing the mold to cure spontaneously.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein the mixture further contains (D) 1 to 5 parts by weight of at least one alkali metal aluminate selected from the group consisting of potassium aluminate and sodium aluminate.
Claim 4
Dependent Claim
35 words
The process of claim 1 wherein the mixture further contains (E) 1 to 5 parts by weight of at least one alkali metal carbonate selected from the group consisting of potassium carbonate and sodium carbonate.
Claim 5
Dependent Claim
61 words
The process of claim 1 wherein the mixture further contains (D) 1 to 5 parts by weight of at least one alkali metal aluminate selected from the group consisting of potassium aluminate and sodium aluminate, and (E) 1 to 5 parts by weight of at least one alkali metal carbonate selected from the group consisting of potassium carbonate and sodium carbonate.
References Cited (Backward Citations)
US3311488A
Cited
US3968828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |