Vacuum pump

Details Vacuum pump Vacuum pump

2005-03-15

2005-03-15

Nguyen, Hoang (Department: 3748)

Rotary kinetic fluid motors or pumps

Smooth runner surface for working fluid frictional contact

C415S143000

Reexamination Certificate

active

06866472

ABSTRACT:
A vacuum pump has a rotor mounted to undergo rotation about a rotational axis. A cylindrical base member surrounds a lower outer periphery of the rotor. A cylindrical pump case surrounds an upper outer periphery of the rotor. The base member has an inner periphery, an outer periphery, and a groove formed between the inner and outer peripheries thereof. The pump case is connected to the base member so that a portion of the outer periphery of the base member confronts a portion of the inner periphery of the pump case. A thread groove is formed in the inner periphery of the base member.

REFERENCES:
patent: 6468030 (2002-10-01), Kawasaki
patent: 6585480 (2003-07-01), Kawasaki et al.
patent: 6599108 (2003-07-01), Yamashita
patent: 6672827 (2004-01-01), Yamashita et al.
patent: 0887556 (1998-12-01), None
Patent Abstracts of Japan vol.2000, No. 11, Jan. 3, 2001 JP 2000 220596 A (Osaka Vacuum Ltd), Aug. 8, 2000.
Patent Abstracts of Japan vol.1999, No. 01, Jan. 29, 1999 JP 10 274189 A (Shimadzu Corp), Oct. 13, 1998.
Patent Abstracts of Japan vol.2000, No. 10, Nov. 17, 2000 JP 2000 205183 A (Nitsubishi Heavy Ind Ltd), Jul. 25, 2000.

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