US4352853A
Expired / Lapsed
US
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Sound absorber
Assignee: Mitsubishi Electric Corp
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Filing: 1981-09-09
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Granted: 1982-10-05
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Expires: 2001-09-09
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 Tanaka
- 👤 Mutsuo Sekiya
- 👤 Yasufumi Ohata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:23
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
32 words
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
32 words
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
28 words
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
26 words
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
36 words
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
36 words
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
52 words
The sound abosrber according to claim 1 wherein said low temperature oxidizing catalyst is made of at least one of an oxide on 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
48 words
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 phosphate, a cement or a silicone resin (varnish).
Claim 9
Dependent Claim
27 words
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
19 words
The sound absorber according to claim 1, 2, 3 or 4 wherein said coated layer is a porous layer.
Claim 11
Dependent Claim
24 words
The sound absorber according to claim 1 or 5 wherein said coated layer is formed on only one surface of said porous metal substrate.
Claim 12
Dependent Claim
22 words
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
41 words
The sound absorber according to claim 1 wherein said coated layer has a matrix of a silicone resin and manganese oxide powder and said porous metal substrate is made of iron, nickel and/or chromium which is prepared by a powdery metallurgy.
Claim 14
Dependent Claim
30 words
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
31 words
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)
US4264660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |