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:
Oct. 23, 1979
Filed:
Jun. 23, 1978
Friedemann Klaffke, Gorxheimertal, DE;
Klaus Heckel, Weinheim, DE;
Firma Carl Freudenberg, Hohnerweg, DE;
Abstract
A flat floor tile or slab, especially for use outdoors, comprising a bottom layer of a closed-cell soft foam having openings geometrically distributed over its area and, bonded thereto, a water-permeable covering layer of resiliently cemented-together granules. Advantageously the tile is provided on its periphery with projections and corresponding recesses, whereby said slab can be interlocked with adjacent slabs. The openings in the tile are formed by slits of about 25 mm arranged in parallel straight lines, slits in each line being spaced about 6 mm apart and adjacent lines being spaced less than about 8 mm from one another, the bottom layer comprising a polyethylene foam of a density of about 90 Kp/m.sup.3 and a thickness of about 10 mm, the covering layer being about 7 mm thick and comprising irregularly structured granules of an average diameter of about 1 to 5 mm and comprising a mixture of mineral particles and rubber particles.