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:
Mar. 20, 2007
Filed:
Mar. 05, 2003
Jin Lin Gao, Allentown, PA (US);
Ralph C. Longsworth, Allentown, PA (US);
Jin Lin Gao, Allentown, PA (US);
Ralph C. Longsworth, Allentown, PA (US);
SHI-APD Cryogenics, Inc., Allentown, PA (US);
Sumitomo Heavy Industries, Tokyo, JP;
Abstract
This invention provides an improved means of quickly warming a pulse tube () by shifting the phase relation of flow to the warm end of the pulse tube relative to flow to the warm end () of the pulse tube relative to flow to the warm end of the regenerator () using a 'four valve' concept and the 'active buffer' concept. Several different pulse tube configurations and valve timing relations that are effective at reversing the cycle from the normal mode, which produces cooling at the pulse tube heat station, to a reverse mode that produces heating are disclosed.