Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Patent
1993-04-28
1995-02-14
Anderson, Bruce C.
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
B01D 5944, H01J 4900
Patent
active
053897854
ABSTRACT:
The invention relates to an ion filter and a method for the production of the ion filter. The ion filter comprises a plurality of elongated solid, rod assemblies. Typically, four rod assemblies, corresponding to four rod electrodes, are utilized. Each rod assembly has a curved rod surface, and at least two abutment surfaces. In one embodiment, the rod is hyperbolic in curvature. These surfaces are formed with one profiled grinding tool simultaneously in such a manner and angle of contact from a processing direction such that no undercuts are formed from this processing direction. The abutment surfaces are shaped such that one abutment surface of one rod assembly can be aligned with another abutment surface of another rod assembly when the rod surfaces are directed toward a longitudinal axis located in the interior of the ion filter. The rod assemblies are electrically insulated from each other with an insulating piece adhesively bonded to each rod assembly.
REFERENCES:
patent: 2520813 (1950-08-01), Rudenberg
patent: 3757115 (1973-09-01), Ball
patent: 4158771 (1979-06-01), Beeck et al.
patent: 4885470 (1989-12-01), Abbott
patent: 4949047 (1990-08-01), Hayward et al.
patent: 5315120 (1994-05-01), Potter
Gore Nigel P.
Rother Helmut
Steiner Urs
Anderson Bruce C.
Finnigan Corporation (a Virginia corporation)
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