Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Plural rigidly related blade sets
Reexamination Certificate
2007-10-09
2007-10-09
Nguyen, Ninh H. (Department: 3745)
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Plural rigidly related blade sets
C415S209100, C415S214100, C415S220000
Reexamination Certificate
active
10890730
ABSTRACT:
A turbomolecular pump includes a plurality of rotor and stator discs arranged alternatively one behind another and producing together a pumping effect, a plurality of spacer rings for retaining the stator discs at a distance from each other; and connection elements for fixedly connecting adjacent spacer rings with each other, so that the spacer rings together provide for securing and centering of the stator discs, taking over the function of a pump housing that is eliminated.
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Abelman ,Frayne & Schwab
Nguyen Ninh H.
Pfieffer Vacuum GmbH
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