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:
May. 14, 1991
Filed:
Jul. 10, 1989
David Jones, Winsford, GB;
C.J.S. Sciences Limited, Cheshire, GB;
Abstract
A valve, which is particularly useful in the inlet system of a mass spectrometer, has a fluid inlet (60) and a fluid outlet (68). A valve seat (64) is disposed between the fluid inlet (60) and the fluid outlet (68), and a valve closure member in the form of a piston (62) sliding in a cylinder (60), and a diaphragm (56), is engageable with the valve seat. A chamber (77) for receiving coolant (e.g. liquid nitrogen) is located on the side of the diaphragm (56) opposite the valve seat (64), and by thus cooling the diaphragm, fluid material in contact with the valve closure member is also cooled, and preferably condensed or frozen. The invention removes the requirement for a U- or T-shaped cold trap as used in conventional systems.