The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 19, 1988
Filed:
Feb. 21, 1986
Applicant:
Inventor:
Hermann Ortwein, Koln, DE;
Assignee:
Clouth Gummiwerke Aktiengesellschaft, Koln, DE;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E01B / ; B32B / ;
U.S. Cl.
CPC ...
238-2 ; 428285 ; 404 31 ;
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.