Reversed, double-helical bellows seal

Details Reversed, double-helical bellows seal Reversed, double-helical bellows seal

2005-05-03

2005-05-03

Nguyen, Henry Hung (Department: 2851)

Photocopying

Projection printing and copying cameras

Step and repeat

C355S072000

Reexamination Certificate

active

06888617

ABSTRACT:
A double bellows seal including a plurality of rings having first and second end rings, a middle ring, a first bellows, and a second bellows. The first bellows is formed from a flexible material that is sealingly connected between the first end ring and the middle ring, and it has a twist bias in a first rotational direction relative to an axis of the rings. The second bellows is formed from a flexible material that is sealingly connected between the second end ring and the middle ring. The second bellows has a twist bias in a second rotational direction relative to an axis of the rings that is opposite that of the first rotational direction.

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patent: WO 0074120 (2000-12-01), None
Miller et al., The Development of 157nm Small Field and Mid-Field MicroStepphers, SPIE 2000 #4000.

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