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:
Feb. 02, 2010
Filed:
Jan. 20, 2005
Mingyao Xu, Emmaus, PA (US);
Jin Lin Gao, Allentown, PA (US);
Eric Seitz, Allentown, PA (US);
Motokazu Saito, Allentown, PA (US);
Mingyao Xu, Emmaus, PA (US);
Jin Lin Gao, Allentown, PA (US);
Eric Seitz, Allentown, PA (US);
Motokazu Saito, Allentown, PA (US);
Sumitomo Heavy Industries, Ltd., Tokyo, JP;
Sumitomo (SHI) Cryogenics of America, Inc., Allentown, PA (US);
Abstract
A rotary valve unit which reduces the torque required to turn the valve disc, and the amount of wear dust that is blown into the cold head, using differential gas forces to keep the valve disc in contact with the valve seat, and which enables larger diameter valve discs to be utilized for multi-ported pulse tubes that have less force on the face of the valve disc, resulting in reduced torque and reduced wear rate.