Patent US4283465A successfully refreshed from Google Patents.
US4283465A
Expired / Lapsed
US
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Porous body of aluminum or its alloy and a manufacturing method thereof
Assignee: Nippon Dia Clevite Co Ltd
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Filing: 1978-08-23
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Granted: 1981-08-11
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Expires: 1998-08-23
Abstract
Abstract A porous sintered material of good permeability and effective sound absorbability, being formed by combining between particles of aluminum or aluminum alloy powder into a body by means of sintering and having connecting pores among the particles of said aluminum or aluminum alloy powder. Said porous sintered material is obtained by mixing aluminum or an aluminum alloy with a low melting point aluminum alloy, forming the mixture into the predetermined shape and sintering it at a temperature which is at least 10° C. lower than the melting point of the base material and higher than that of the low melting point material.
Inventors
- 👤 Toru Morimoto
- 👤 Tsuyoshi Ohsaki
- 👤 Toshio Ohkawa
- 👤 Kenji Matsuzawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:56
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F2998/00; B22F2998/10; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12153; Y10T428/1216
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
87 words
A porous body having excellent sound absorbing properties composed of a sintered body of stick-shaped, needle-shaped, oval-shaped or other irregular-shaped particles of a base material of aluminum or aluminum alloy powder and a second material of alumium alloy powder having a melting point at least 10° C. lower than the melting point of said base material, said porous body having a network of connecting pores communicating with the surface of said body with a pore ratio of 33 to 50% of the total volume of the body.
Claim 2
Dependent Claim
87 words
A porous body having excellent sound absorbing properties composed of a sintered body of stick-shaped, needle-shaped, oval-shaped or other irregular-shaped particles of a base material of aluminum or aluminum alloy powder and a second material of alumium alloy powder having a melting point at least 10° C. lower than the melting point of said base material, said porous body having a network of connecting pores communicating with the surface of said body with a pore ratio of 33 to 50% of the total volume of the body.
Claim 3
Independent Claim
108 words
A method of manufacturing a porous body comprising the steps of mixing a base material of powder and/or granular aluminum or aluminum alloy with a second material of powder and/or granular aluminum alloy, the melting point of said second material being at least 10° C. lower than that of the base material, forming the mixture into a predetermined shape under a pressure of 0.8×10 -3 kg/cm 2 or less, and sintering said mixture in a nonoxidizing or inert atmosphere at a temperature which is at least 10° C. lower than the melting point of the base material and is higher than the melting point of the second material.
Claim 4
Independent Claim
108 words
A method of manufacturing a porous body comprising the steps of mixing a base material of powder and/or granular aluminum or aluminum alloy with a second material of powder and/or granular aluminum alloy, the melting point of said second material being at least 10° C. lower than that of the base material, forming the mixture into a predetermined shape under a pressure of 0.8×10 -3 kg/cm 2 or less, and sintering said mixture in a nonoxidizing or inert atmosphere at a temperature which is at least 10° C. lower than the melting point of the base material and is higher than the melting point of the second material.
Claim 5
Dependent Claim
112 words
A porous body as in claim 1 made by a method comprising the steps of mixing a base material of powder and/or granular aluminum or aluminum alloy with a second material of powder and/or granular aluminum alloy, the melting point of said second material being at least 10° C. lower than that of the base material, forming the mixture into a predetermined shape under a pressure of 0.8×10 -3 kg/cm 2 or less, and sintering said mixture in a nonoxidizing or inert atmosphere at a temperature which is at least 10° C. lower than the melting point of the base material and is higher than the melting point of the second material.
Claim 6
Dependent Claim
20 words
A porous body as in claim 1 wherein the base material is aluminum and the second material is Al-Cu alloy.
Claim 7
Dependent Claim
20 words
A porous body as in claim 1 wherein the base material is aluminum and the second material is Al-Mg alloy.
Claim 8
Dependent Claim
20 words
A porous body as in claim 1 wherein the base material is aluminum and the second material is Al-Si alloy.
Claim 9
Dependent Claim
21 words
A porous body as in claim 1 wherein the base material is Al-Cu alloy and the second material is Al-Cu alloy.
Claim 10
Dependent Claim
21 words
A porous body as in claim 1 wherein the base material is Al-Cu alloy and the second material is Al-Mg alloy.
Claim 11
Dependent Claim
21 words
A porous body as in claim 1 wherein the base material is Al-Cu alloy and the second material is Al-Si alloy.
Claim 12
Dependent Claim
21 words
A porous body as in claim 1 wherein the base material is Al-Mg-Si-Cu-Mn alloy and the second material is Al-Mg alloy.
Claim 13
Dependent Claim
15 words
A porous body as in claim 1 wherein the pore ratio is 35 to 45%.
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) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |