US3756507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railroad track bed
Assignee: Stahlwerke Pein Salzgitter AG
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Filing: 1971-08-04
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Granted: 1973-09-04
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Expires: 1991-08-04
Abstract
Abstract A railroad track bed consists of a roadbed sealingly supporting a multiplicity of longitudinally interconnected concrete slabs and defining a space between the lateral supports and the slabs which is filled with a cellular resin or elastomer. The filling consists in whole or in part of preformed foamed synthetic resin bodies, preferably locked together in a continuous resin (foam) matrix.
Inventors
- 👤 S Hanig
- 👤 K Mienes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:09
CPC Classifications
E; E01; E01B; E01B1/00; E01B1/008; E01B3/00; E01B3/28; E01B3/38; E01C; E01C3/00; E01C3/06; E01B1/001; E01B1/002
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
A railroad bed comprising: a bed of ballast forming a generally horizontal support surface; a plurality of horizontally interconnected generally rectangular concrete slabs spacedly overlying said support surface formed by said bed of ballast; cushion means substantially filling the space between said slabs and said surface and in contact at least with said bed of ballast, said cushion means being formed at least in part by at least one a hollow body filled with a foamed synthetic resin, said hollow body having a flexible outer skin around said foamed synthetic resin; and a pair of rails mounted on the upper side of said concrete slabs.
Claim 2
Dependent Claim
105 words
A railroad bed comprising: a bed of ballast forming a generally horizontal support surface; a plurality of horizontally interconnected generally rectangular concrete slabs spacedly overlying said support surface formed by said bed of ballast; cushion means substantially filling the space between said slabs and said surface and in contact at least with said bed of ballast, said cushion means being formed at least in part by at least one a hollow body filled with a foamed synthetic resin, said hollow body having a flexible outer skin around said foamed synthetic resin; and a pair of rails mounted on the upper side of said concrete slabs.
Claim 3
Dependent Claim
32 words
The railroad bed defined in claim 1 wherein a multiplicity of such hollow bodies are provided in said space, said bed further comprising a synthetic resin matrix joining said hollow bodies together.
Claim 4
Dependent Claim
31 words
The railroad bed defined in claim 1 wherein said slabs are provided along their undersides with a synthetic resin plate extending into said space and forming part of said cushion means.
Claim 5
Dependent Claim
15 words
The railroad bed defined in claim 3, wherein said plate consists of a cellular polyurethane.
Claim 6
Dependent Claim
30 words
The railroad bed defined in claim 3, wherein said hollow bodies include a foil sealed along its edges to said plate and defining a pouch for a foamed synthetic resin.
Claim 7
Dependent Claim
22 words
The railroad bed defined in claim 1 wherein said hollow body is a flexible synthetic-resin foil pouch filled with foamed synthetic resin.
Claim 8
Dependent Claim
23 words
The railroad bed defined in claim 6 wherein said pouch is filled with a mixture of hollow elements and a foamed synthetic-resin binder.
Claim 9
Dependent Claim
21 words
The railroad bed defined in claim 1 wherein said hollow body is a foamed synthetic-resin ball provided with a densified skin.
Claim 10
Dependent Claim
15 words
The railroad bed defined in claim 1 wherein said hollow body is an inflated balloon.
Claim 11
Dependent Claim
24 words
The railroad bed defined in claim 1 wherein said space is filled with a multiplicity of hollow bodies foamed in situ and bonded together.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |