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:
Nov. 09, 2004
Filed:
Dec. 10, 2002
Roger Artindale Heron, Stagsden, GB;
Peter Derek Daniels, Daventry, GB;
David Michael Crowley, Marlow Bottom, GB;
Oxford Magnet Technology Limited, Oxford, GB;
Abstract
A pulse tube refrigerator comprises a fixed pressure casing ( ) containing cold parts and a removable pressure casing ( ) containing serviceable parts. The fixed pressure casing ( ) and the removable pressure casing ( ) are coupled together via a joining member ( ). During cooling operation the joining member ( ) is arranged such that refrigerant fluid flows between the fixed and the removable casings. During servicing the joining member is arranged to cut off flow of refrigerant fluid between the fixed and removable casings, such that refrigerant in the fixed casing is trapped and parts in the removable casing are accessible for servicing. After servicing, substantially pure refrigerant fluid is pumped into the removable casing ( ), the fixed and removable casings are re-joined and the joining member ( ) is arranged such that refrigerant fluid flows between the casings again.