Patent US4802527A successfully refreshed from Google Patents.
US4802527A
Expired / Lapsed
US
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Apparatus for casting molten metal
Assignee: SWISS ALUMINIUM Ltd A CORP OF SWITZERLAND
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Filing: 1987-11-16
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Granted: 1989-02-07
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Expires: 2007-11-16
Abstract
Abstract Apparatus for casting molten metal including a mold for casting molten metal having a base portion, a molten metal inlet located at the base portion, a filter positioned across the molten metal inlet so that all the molten metal must pass therethrough and a well beneath said inlet and beneath said filter.
Inventors
- 👤 Jerry W. Brockmeyer
- 👤 Michael A. Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:23
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/08; B22C9/086
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
An apparatus for casting molten metal which comprises: a mold for casting molten metal having a base portion; a molten metal inlet located at the base portion; a horizontally disposed filter positioned across the molten metal inlet so that all molten metal must pass therethrough; an annular holding means disposed above said filter to hold said filter in place and to prevent mechanical damage to the filter; and a well beneath said inlet and beneath said filter.
Claim 2
Independent Claim
77 words
An apparatus for casting molten metal which comprises: a mold for casting molten metal having a base portion; a molten metal inlet located at the base portion; a horizontally disposed filter positioned across the molten metal inlet so that all molten metal must pass therethrough; an annular holding means disposed above said filter to hold said filter in place and to prevent mechanical damage to the filter; and a well beneath said inlet and beneath said filter.
Claim 3
Dependent Claim
25 words
An apparatus according to claim 1 including a plurality of said molds with a common sprue and runners extending from the sprue to each mold.
Claim 4
Dependent Claim
21 words
An apparatus according to claim 1 wherein the well has a volume at least two times the volume of the filter.
Claim 5
Dependent Claim
18 words
An apparatus according to claim 3 wherein said volume is below ten times the volume of the filter.
Claim 6
Dependent Claim
29 words
An apparatus according to claim 1 including a circumferential molten metal inlet channel adjacent said well for molten metal flow to said well to create a swirling action therein.
Claim 7
Dependent Claim
21 words
An apparatus according to claim 1 wherein said holding means is an annular support plate extending across said molten metal inlet.
Claim 8
Independent Claim
90 words
An apparatus for casting molten metal which comprises: a mold for casting molten metal having a base portion; a molten metal inlet located at the base portion; a filter positioned across the molten metal inlet so that all molten metal must pass therethrough; means to hold said filter in place comprising a support plate including an annular ring extending across said molten metal inlet above said filter with at least one passageway therein for the flow of molten metal therethrough; and a well beneath said inlet and beneath said filter.
Claim 9
Independent Claim
90 words
An apparatus for casting molten metal which comprises: a mold for casting molten metal having a base portion; a molten metal inlet located at the base portion; a filter positioned across the molten metal inlet so that all molten metal must pass therethrough; means to hold said filter in place comprising a support plate including an annular ring extending across said molten metal inlet above said filter with at least one passageway therein for the flow of molten metal therethrough; and a well beneath said inlet and beneath said filter.
Claim 10
Dependent Claim
14 words
An apparatus according to claim 7 wherein said support plate includes spaced passageways therein.
Claim 11
Independent Claim
70 words
An apparatus for casting molten metal which comprises: a mold for casting molten metal having a base portion; a molten metal inlet located at the base portion; a filter positioned across the molten metal inlet so that all molten metal must pass therethrough; a metal foil beneath said filter having a lower melting point than the molten metal being cast; and a well beneath said inlet and beneath said filter.
Claim 12
Independent Claim
70 words
An apparatus for casting molten metal which comprises: a mold for casting molten metal having a base portion; a molten metal inlet located at the base portion; a filter positioned across the molten metal inlet so that all molten metal must pass therethrough; a metal foil beneath said filter having a lower melting point than the molten metal being cast; and a well beneath said inlet and beneath said filter.
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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |