Patent US4720043A successfully refreshed from Google Patents.
US4720043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resilient ballast underlayment mat including nonwoven fiber fleece layers
Assignee: Clouth Gummiwerke AG
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Filing: 1986-02-21
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Granted: 1988-01-19
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Expires: 2006-02-21
Abstract
Abstract A road bed for railway rails comprises a ballast underlayment mat in the form of a body of elastomeric material. The mat has, at its bottom, prominent projecting parts of the elastomeric material and is covered by stone ballast. At least one fiber fleece layer on the top of the mat limits penetration of the stone ballast into the elastomeric material.
Inventors
- 👤 Hermann Ortwein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:40
CPC Classifications
E; E01; E01B; E01B1/00; E01B1/001; E01B1/002; E01B1/005; E01B2204/00; E01B2204/01; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/674; Y10T442/679
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
126 words
In a road bed for railway rails, a sound-damping support assembly for the rails which consists of the combination of a ballast underlayment mat and a stone ballast on top of said mat, wherein said mat consists essentially of a body of elastomeric material formed at a bottom side thereof with prominent and projecting parts of said elastomeric material and at an upper side thereof with at least one layer consisting of a fiber fleece of nonwoven fiber limiting penetration of the stone ballast into the elastomeric material, a plurality of spaced apart layers of said fiber fleece of nonwoven fiber being provided at said upper side of said mat and said layers of fiber fleece being separated from one another by an intermediate resilient layer.
Claim 2
Dependent Claim
126 words
In a road bed for railway rails, a sound-damping support assembly for the rails which consists of the combination of a ballast underlayment mat and a stone ballast on top of said mat, wherein said mat consists essentially of a body of elastomeric material formed at a bottom side thereof with prominent and projecting parts of said elastomeric material and at an upper side thereof with at least one layer consisting of a fiber fleece of nonwoven fiber limiting penetration of the stone ballast into the elastomeric material, a plurality of spaced apart layers of said fiber fleece of nonwoven fiber being provided at said upper side of said mat and said layers of fiber fleece being separated from one another by an intermediate resilient layer.
Claim 3
Dependent Claim
55 words
The assembly defined in claim 1 wherein a cover layer of an elastomeric material is provided on said mat above said fleece and resilient layers and between said stone ballast and an uppermost one of said fleece layers, said cover layer having a thickness which is about half the thickness of said intermediate resilient layer.
Claim 4
Dependent Claim
12 words
The assembly defined in claim 2 wherein said cover layer contains fibers.
Claim 5
Dependent Claim
113 words
In a road bed for railway rails, a sound-damping support assembly for the rails which consists of the combination of a ballast underlayment mat and a stone ballast on top of said mat, wherein said mat consists essentially of a body of elastomeric material formed at a bottom side thereof with prominent and projecting parts of said elastomeric material and at an upper side thereof with at least one layer consisting of a fiber fleece of nonwoven fiber limiting penetration of the stone ballast into the elastomeric material, a cover layer of an elastomeric material being provided on said mat above said fleece layer and between said stone ballast and said fleece layer.
Claim 6
Dependent Claim
113 words
In a road bed for railway rails, a sound-damping support assembly for the rails which consists of the combination of a ballast underlayment mat and a stone ballast on top of said mat, wherein said mat consists essentially of a body of elastomeric material formed at a bottom side thereof with prominent and projecting parts of said elastomeric material and at an upper side thereof with at least one layer consisting of a fiber fleece of nonwoven fiber limiting penetration of the stone ballast into the elastomeric material, a cover layer of an elastomeric material being provided on said mat above said fleece layer and between said stone ballast and said fleece layer.
Claim 7
Dependent Claim
12 words
The assembly defined in claim 4 wherein said cover layer contains fibers.
References Cited (Backward Citations)
US2165955A
Cited
US3568579A
Cited
US3587964A
Cited
US4025686A
Cited
US4235371A
Cited
US4362780A
Cited
US4311273A
Cited
DE3019531A1
Cited
US4353947A
Cited
US4368844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-18 | 1991-07-20 | 1992-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-18 | 1995-07-20 | 1996-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-18 | 1999-07-20 | 2000-01-19 | $7700.00 | Window Closed / Lapsed |