Refrigeration – Low pressure cold trap process and apparatus
Reexamination Certificate
2008-06-24
2008-06-24
Doerrler, William C (Department: 3744)
Refrigeration
Low pressure cold trap process and apparatus
Reexamination Certificate
active
07389645
ABSTRACT:
A method and apparatus to shield a cryogenic pump in a physical vapor deposition chamber comprising a physical vapor deposition chamber, a gasket in thermal contact with the physical vapor deposition chamber, at least one post in contact with the gasket, a radiation shield connected at the top of the post, and at least one intermediate ring in contact with the post. A method and apparatus for a radiation shield for a cryogenic pump comprising a cryogenic pump with a region upstream from the cryogenic pump, a gasket in thermal contact the region upstream from the cryogenic pump, at least one post in contact with the gasket, a radiation shield connected at the top of the post, and at least one intermediate ring in contact with the post.
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Applied Materials Inc.
Doerrler William C
Patterson & Sheridan LLP
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