The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 21, 1998
Filed:
Feb. 05, 1997
Applicant:
Inventors:
Allen J Bartlett, Mendon, MA (US);
John J Casello, Norton, MA (US);
Assignee:
Helix Technology Corporation, Mansfield, MA (US);
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
62 555 ; 417901 ;
Abstract
A cryopump includes a two-stage refrigerator, a primary pumping surface, and a radiation shield. The radiation shield is in thermal contact with the first stage of the refrigerator. The primary pumping surface is surrounded by the radiation shield and is in thermal contact, through a direct conductive link, with the second stage of the refrigerator. The refrigerator, however, is external to the radiation shield.