Patent ID: 7134835

Claim:
A process for manufacturing stators of vacuum pump, comprising the steps of: forming a plurality of discs or rings ( 11 a ; 11 b ; 11 c ), each disc or ring ( 11 a ; 11 b ; 11 c ) of said plurality having at least one notch ( 13 ; 15 ); and coaxially superimposing and rotating said discs or rings ( 11 a ; 11 b ; 11 c ) relative to each other to form at least one stator surface ( 17 ; 19 ), and defining on said stator surface ( 17 ; 19 ) at least one helical groove ( 13 ′; 15 ′) corresponding to said notches ( 13 ; 15 ) for pumping gas extending in a substantially axial direction with respect to a stator body.