Patent US3896897A successfully refreshed from Google Patents.
US3896897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust muffler
Assignee: West Chester Chemical Co Inc
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Filing: 1973-10-11
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Granted: 1975-07-29
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Expires: 1993-10-11
Abstract
Abstract This invention relates to an improved sound dampener or muffler primarily useful in reducing the noise level resulting from exhaust gases. The invention has particular applicability to the reduction of noise produced by pneumatic tools such as air hammers, air drills and air wrenches.
Inventors
- 👤 Jr Edward O Hilbush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:45
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/16; B; B25; B25D; B25D17/00; B25D17/11; B25D17/12; F01N1/00; F01N1/24; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/24999
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
82 words
A sound-deadening laminated article of manufacture for use in the muffling of exhaust gas noises comprising an inner first sheet of fabric, an intermediate second sheet of open cell, elastomeric material secured to the surface of said inner first sheet, a third sheet of flexible lead of a thickness in the range 0.0075 inch to 0.015 inch secured to the surface of the sheet of elastomeric material, and an outer sheet of fabric secured to the surface of said flexible lead sheet.
Claim 2
Dependent Claim
82 words
A sound-deadening laminated article of manufacture for use in the muffling of exhaust gas noises comprising an inner first sheet of fabric, an intermediate second sheet of open cell, elastomeric material secured to the surface of said inner first sheet, a third sheet of flexible lead of a thickness in the range 0.0075 inch to 0.015 inch secured to the surface of the sheet of elastomeric material, and an outer sheet of fabric secured to the surface of said flexible lead sheet.
Claim 3
Dependent Claim
34 words
The article of claim 1 in which the outer sheet of fabric is woven Nylon and is impregnated with neoprene and which has a thickness in the range of 0.005 inch to 0.015 inch.
Claim 4
Dependent Claim
70 words
A muffler for a pneumatic tool having at least one exhaust port comprising an inner sheet of open cell elastomeric material, a fabric casing for said elastomeric sheet, a second sheet of flexible sound deadening metal, an outer third sheet of protective impregnated fabric, means for laminating said sheets together, and means including at least one strap for securing said laminated sheets to the pneumatic tool covering the exhaust port.
Claim 5
Dependent Claim
70 words
A muffler for a pneumatic tool having at least one exhaust port comprising an inner sheet of open cell elastomeric material, a fabric casing for said elastomeric sheet, a second sheet of flexible sound deadening metal, an outer third sheet of protective impregnated fabric, means for laminating said sheets together, and means including at least one strap for securing said laminated sheets to the pneumatic tool covering the exhaust port.
Claim 6
Dependent Claim
26 words
A muffler in accordance with claim 3 in which the metallic sheet is provided with at least one aperture to permit passage of exhaust fluid therethrough.
Claim 7
Dependent Claim
18 words
A muffler in accordance with claim 4 in which the aperture is offset axially from the exhaust port.
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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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |