A flooring panel or wall panel (20) is provided with a tongue (1) and a groove (2) each comprising cooperating locking means in the form of ribs (11, 12) and grooves (9, 10). The locking means of the upper side and lower side of the tongue (1) and groove (2) respectively are arranged staggered in an...http://www.google.es/patents/US20020100242?utm_source=gb-gplus-sharePatente US20020100242 - Flooring panel or wall panel
Número de solicitud: 09/878,252 Número de publicación: US 2002/0100242 A1 Fecha de presentación: 12 Jun 2001 Patente emitida: US6601359 ( Fecha de emisión 5 Ago 2003)
