IPC Definitions - January 01, 2012
D04H 1/593 - Definition
This group covers:
Multi-layered non-woven fabrics using chemical or thermoplastic bonding agents in which layers are made continuously, and which are also included in the scope of the upper group, namely, formed wholly or mainly of staple fibres or like relatively short fibres and formed from fleeces or layers composed of fibres without existing or potential cohesive properties. Example is shown below.
US 4521477 A1