Twin-shaft vacuum pump and method of forming same

Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone

Reexamination Certificate

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C418S201100, C418S200000

Reexamination Certificate

active

10752064

ABSTRACT:
A twin-shaft vacuum pump includes two shafts and two rotors supported on respective shafts and cooperating with each other for producing a pumping effect, with each rotor being formed of a plurality of discoid components.

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Patent Abstract of Japan, JP-06101671, Apr. 1994.
Patent Abstracts of Japan JP 04 058093, Feb. 1992.
Patent Abstracts of Japan JP 58 041634, Mar. 1983.

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