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:
Apr. 21, 1981
Filed:
Mar. 21, 1979
Applicant:
Inventors:
John C Lucas, Allestree, GB;
William K Aitken, Weston-on-Trent, GB;
Assignee:
British Railways Board, , GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E01B / ;
U.S. Cl.
CPC ...
238-7 ; 238-2 ; 238284 ;
Abstract
A concrete slab structure for supporting railway track is itself resiliently supported on a base structure by a spring system comprising tubes secured against longitudinal movement in holes extending through the slab from its top surface to its bottom surface, springs each arranged in a respective one of the tubes and an adjustable spring abutment at the upper end of each of the tubes for pre-loading the springs against the base structure.