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Patent US4235277A successfully refreshed from Google Patents.
US4235277A
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US
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Method of forming three-dimensional network porous metallic structure having continuous internal cavity
Assignee: Hitachi Ltd
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Filing: 1978-09-27
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Granted: 1980-11-25
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Expires: 1998-09-27
Abstract
Abstract A three-dimensional network porous metallic structure is formed by filling the internal cavity of a mold, which has been prepared by making use of a three-dimensional network resin pattern, through driving the molten metal into the cavity by a pressure or through sucking the molten metal into the cavity by reducing the pressure in the cavity. The porous metallic structure thus obtained is characterized by a large specific surface area, as well as a reduced pressure drop of fluid passing through this structure, and, therefore, is fit for various uses such as the material of fins of heat exchangers, various filters and so forth.
Inventors
- 👤 Tatsushi Aizawa
- 👤 Tatsuo Natori
- 👤 Masakatsu Hayashi
- 👤 Takeo Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:20
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2093; B22; B22C; B22C9/00; B22C9/02; B22C9/04; B22D; B22D21/00; B22D21/002; B22D21/007; B22D25/00; B22D25/02; C; C22; C22C; C22C1/00; C22C1/08; F; F28; F28D; F28D15/00; F28D15/02; F28D15/04; F28D15/046; F28F; F28F13/00; F28F13/003; Y; Y10; Y10S; Y10S425/00; Y10S425/012
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
191 words
A method of forming a three-dimensional network porous metallic structure having a continuous internal cavity, comprising the steps of: preparing a three-dimensional network pattern made of a resin; filling the internal cavity of said pattern with a mold-forming material; extinguishing said pattern to form a mold having a three-dimensional network cavity; placing a molten metal reservoir, containing molten metal, in a pressure vessel; bringing a portion of said mold into contact with said molten metal held in the reservoir located in said pressure vessel, said mold being held in a holding device which has a passageway which is in communication with said mold and extends external to said pressure vessel, said holding device enclosing said mold except for said portion of said mold and the part of the mold in communication with the passageway; raising the pressure in said pressure vessel to 2 atmospheres to thereby raise the pressure on the molten metal in the molten metal reservoir so as to feed said molten metal by pressure into the internal cavity of said mold; and removing said mold after the solidification of said metal in the internal cavity of the mold.
Claim 2
Independent Claim
191 words
A method of forming a three-dimensional network porous metallic structure having a continuous internal cavity, comprising the steps of: preparing a three-dimensional network pattern made of a resin; filling the internal cavity of said pattern with a mold-forming material; extinguishing said pattern to form a mold having a three-dimensional network cavity; placing a molten metal reservoir, containing molten metal, in a pressure vessel; bringing a portion of said mold into contact with said molten metal held in the reservoir located in said pressure vessel, said mold being held in a holding device which has a passageway which is in communication with said mold and extends external to said pressure vessel, said holding device enclosing said mold except for said portion of said mold and the part of the mold in communication with the passageway; raising the pressure in said pressure vessel to 2 atmospheres to thereby raise the pressure on the molten metal in the molten metal reservoir so as to feed said molten metal by pressure into the internal cavity of said mold; and removing said mold after the solidification of said metal in the internal cavity of the mold.
Claim 3
Dependent Claim
44 words
A method of forming a three-dimensional network porous metallic structure having a continuous internal cavity as set forth in claim 1, wherein the resin of which said pattern is made is a material selected from a group consisting of polyurethane, polyether, polyester and rubber.
Claim 4
Dependent Claim
28 words
A method of forming a three-dimensional network porous metallic structure having a continuous internal cavity as set forth in claim 2, wherein said mold is made of plaster.
Claim 5
Dependent Claim
31 words
A method of forming a three-dimensional network porous metallic structure having a continuous internal cavity as set forth in claim 1, wherein said pattern is extinguished by means of a solvent.
Claim 6
Dependent Claim
28 words
A method of forming a three-dimensional network porous metallic structure having a continuous internal cavity as set forth in claim 1, wherein said pattern is extinguished by heating.
Claim 7
Dependent Claim
41 words
A method of forming a three-dimensional network porous metallic structure having a continuous internal cavity as set forth in claim 1, wherein the pattern has a number of pores defined by lattices of thickness ranging between 0.05 mm and 0.7 mm.
Claim 8
Dependent Claim
61 words
A method of forming a three-dimensional network porous metallic structure having a continuous internal cavity as set forth in claim 1, wherein said portion of said mold is brought into contact with the molten metal by dipping said mold into the molten metal such that the lower end of the mold is 5 mm below the surface of the molten metal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |