EP0061008A1
Expired / Lapsed
EP
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Sound absorber
Assignee: Mitsubishi Electric Corp
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Filing: 1982-02-24
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Granted: —
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Expires: 2002-02-24
Abstract
Abstract A sound absorber comprises a layer of a composition of a heat resistant binder and an acidic solid catalyst which is coated on a porous metal substrate in the hardened form.
Inventors
- 👤 Fusaoki Uchikawa
- 👤 Hideharu Mitsubishi Denki K.K. Tanaka
- 👤 Mutsuo Mitsubishi Denki K.K. Sekiya
- 👤 Yasufumi Ohata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 11:08
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J; B01J37/00; B01J37/02; B01J37/024; B01J37/0246; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249986; Y10T428/249994; Y10T428/25; Y10T428/256; Y10T428/257
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
33 words
1) A sound absorber which comprises a layer of a composition of a heat resistant binder and an acidic solid catalyst which is coated on a porous metal substrate in the hardened form.
Claim 2
Dependent Claim
33 words
1) A sound absorber which comprises a layer of a composition of a heat resistant binder and an acidic solid catalyst which is coated on a porous metal substrate in the hardened form.
Claim 3
Dependent Claim
29 words
2) The sound absorber according to Claim 1 wherein said layer of a composition comprises a heat resistant binder, an acidic solid catalyst and a low temperature oxidizing catalyst.
Claim 4
Dependent Claim
28 words
3) The sound absorber according to Claim 1 wherein said layer of a composition comprises a heat resistant binder, an acidic ' solid catalyst and a reducing agent.
Claim 5
Dependent Claim
38 words
4 ) The sound absorber according to Claim 1 wherein said layer of a composition comprises a heat resistant binder, an acidic solid catalyst, a lower temperature oxidizing catalyst and a reducing agent or an alkaline solid catalyst.
Claim 6
Dependent Claim
38 words
5) The sound absorber according to Claim 1 wherein the acidic solid catalyst is at least one of natural zeolite, activated clay, silica-zirconia, silica-magnesia, activated alumina, silica-alumina, vanadium pentoxide , alumina-boron oxide, zeolite, synthetic zeolite, and acid clay.
Claim 7
Dependent Claim
53 words
6) The sound abosrber according to Claim 1 wherein said low temperature oxidizing catalyst is made of at least one of an oxide of Mn, Cu, Ni, Co. Mo. Cr, Fe, Ag, Zn, Pb, W or V or a complex oxide thereof or a metal of Pt, Pd, Rh, Ru, Ag or Au.
Claim 8
Dependent Claim
52 words
7) The . sound absorber according to Claim 1 wherein said coated layer has a binder in the form of a matrix made of at least one of porcelain enamel, glass frit, an alkali metal silicate, colloidal silica, colloidal alumina, a metal ph p sphate, a cement or a silicone resin (varnish).
Claim 9
Dependent Claim
28 words
8) The sound absorber according to Claim 1 wherein said porous metal substrate is made of at least one of iron, nickel or chromium as a main component.
Claim 10
Dependent Claim
20 words
9) The sound absorber according to Claim 1, 2, 3 or 4 wherein said coated layer is a porous layer.
Claim 11
Dependent Claim
25 words
10) The sound absorber according to Claim -1 or 5 wherein said coated layer is formed on only one surface of said porous metal substzate.
Claim 12
Dependent Claim
23 words
11) The sound absorber according to Claim 1 which is used in an exhaust system of an internal-combustion engine or a combustion device.
Claim 13
Dependent Claim
42 words
12) The sound absorber according to Claim 1 wherein said coated layer has a matrix of a silicone resin and manganese oxide powder an said porous metal substrate is made of iron, niclkel and/or chromium which is prepared by a powdery metallurgy.
Claim 14
Dependent Claim
31 words
13) The sound absorber according to Claim 3 wherein the reducing agent is at least one of metallic powders, carbon powder, sulfites, ferrous salts and stannous salts which are thermally stable.
Claim 15
Dependent Claim
32 words
14) The sound absorber according to Claim 3 wherein the alkaline solid catalyst is at least one of potassium silicate, sodium aluminate, sodium silicate, lithium silicate, sodium carbonate and alkali metal oxides.
References Cited (Backward Citations)
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