A separable slide fastener comprises a pair of warp-knit stringer tapes each having a pair of webs with a wale-free region therebetween, which are interconnected by a connector thread extending across the wale-free region at longitudinal intervals, the wale-free region being receptive of a chain of thread...http://www.google.es/patents/US4425684?utm_source=gb-gplus-sharePatente US4425684 - Separable slide fastener
