Open-end spinning machines or arrangements for imparting twist to independently moving fibres

Official title: Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques {(arrangements with two or more spinning or twisting devices of different types in combination D01H7/90)}

D01H4/00 (Open-end spinning machines or arrangements for imparting twist to independently moving fibres) appears on 1,295 US grants and 351 published applications in this corpus.