US3645491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soluble metal casting cores comprising a water-soluble salt and a synthetic resin
Assignee: AEROPLANE MOTOR ALUMINUM CASTI
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Filing: 1969-07-22
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Granted: 1972-02-29
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Expires: 1989-07-22
Abstract
Abstract This invention discloses novel water-soluble cores for use in the casting of metals, and also methods of making such cores. The cores essentially consist of a water-soluble salt and a synthetic resin. One form of the core consists of a mixture of a water-soluble salt and a liquid synthetic resin binder such as to retain the salt grains in the agglomerate. Another form of the core consists of grains of a water-soluble salt which are coated with a synthetic resin and subsequently dried to a powder.
Inventors
- 👤 Warwick N Brown
- 👤 Peter M Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:07
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/10; B22C9/105; Y; Y10; Y10S; Y10S264/00; Y10S264/44
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
26 words
The water-soluble core of claim 1, comprising a mixture of a water-soluble salt and a liquid resin binder to retain the salt grains in the agglomerate.
Claim 2
Dependent Claim
19 words
The water-soluble core of claim 1, comprising grains of a water-soluble salt which are coated with a synthetic resin.
Claim 3
Dependent Claim
28 words
The water-soluble core of claim 1, in which the water-soluble salt is a granular or crystalline chloride, sulphate or carbonate salt or any compatible mixture of such salts.
Claim 4
Dependent Claim
25 words
The water-soluble core of claim 1, which also includes a catalyst or accelerator required for the conversion of the resin to a preformed hardened state.
Claim 5
Dependent Claim
15 words
The water-soluble core of claim 1, wherein the synthetic resin is a melamine formaldehyde resin.
Claim 6
Dependent Claim
15 words
The water-soluble core of claim 1, wherein the synthetic resin is a phenol formaldehyde resin.
Claim 7
Dependent Claim
15 words
The water-soluble core of claim 1, wherein the synthetic resin is a phenol furfuryl resin.
Claim 8
Dependent Claim
15 words
The water-soluble core of claim 1, wherein the synthetic resin is a urea furfuryl resin.
Claim 9
Dependent Claim
15 words
The water-soluble core of claim 1, wherein the synthetic resin is a urea formaldehyde resin.
Claim 10
Independent Claim
54 words
A method of making a water-soluble core comprising grains of a water soluble salt and up to 10 percent by weight of said salt of a synthetic resin wherein the water-soluble salt and resin are injected or blown into a core box in which the resin is subsequently cured and the core is formed.
Claim 11
Dependent Claim
43 words
The method as claimed in claim 11, in which grains of a water-soluble salt are coated with a synthetic resin and subsequently dried to a powder prior to blowing into a core box, the temperature of which is raised to cure the resin.
Claim 12
Dependent Claim
60 words
A method of making a soluble core as claimed in claim 11, comprising the steps of adding the synthetic resin to the water-soluble salt, thoroughly mixing together the synthetic resin and the water-soluble salt to form a damp mass, injecting said damp mass under pressure into a core box, and heating the core box sufficient to cure the synthetic resin.
Claim 13
Dependent Claim
26 words
The method as claimed in claim 13, in which the mixture is injected into the core box at an injection pressure between 70 and 110 p.s.i.
References Cited (Backward Citations)
CA725240A
Cited
GB854844A
Cited
US3116522A
Cited
US3062760A
Cited
US3326822A
Cited
US3459253A
Cited
US3356129A
Cited
US3407864A
Cited
US3548914A
Cited
US3577367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |