Patent US4357393A successfully refreshed from Google Patents.
US4357393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered porous metal plate and its production
Assignee: Katuragi Sangyo Co Ltd
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Filing: 1980-04-08
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Granted: 1982-11-02
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Expires: 2000-04-08
Abstract
Abstract The present invention relates to a sintered porous metal plate which comprises metal particles directly and integrally bonded together by sintering under pressure, said plate being of a porous structure and having a density gradient in the direction of thickness. The present invention is also directed to a method of making such a sintered porous plate.
Inventors
- 👤 Masatoshi Tsuda
- 👤 Takeshi Kobayashi
- 👤 Katsumi Kaitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:57
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/002; B22F7/06; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12021; Y10T428/12028; Y10T428/12042; Y10T428/12063
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
A sound absorbing or vibration absorbing sintered porous metal plate which comprises metal particles directly and integrally bonded together due to sintering and pressing without the use of a binder material, said plate being of porous structure and having a continuous density gradient in the direction of thickness and a multi-layer structure comprising two coarse layers with a dense layer therebetween.
Claim 2
Dependent Claim
61 words
A sound absorbing or vibration absorbing sintered porous metal plate which comprises metal particles directly and integrally bonded together due to sintering and pressing without the use of a binder material, said plate being of porous structure and having a continuous density gradient in the direction of thickness and a multi-layer structure comprising two coarse layers with a dense layer therebetween.
Claim 3
Dependent Claim
31 words
A sound absorbing or vibration absorbing sintered porous metal plate as claimed in claim 1 wherein the metal is selected from the group consisting of ferrous metal materials and aluminum alloys.
Claim 4
Dependent Claim
29 words
A sound absorbing or vibration absorbing sintered porous metal plate as claimed in claim 2 wherein the metal is cast iron in the form of cutting chips or abatements.
Claim 5
Dependent Claim
24 words
A sound absorbing or vibration absorbing sintered porous metal plate as claimed in claim 1 wherein the plate has a porosity of about 40-60%.
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) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |