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:
Jan. 23, 2007
Filed:
Nov. 02, 2005
William A. Little, Palo Alto, CA (US);
William A. Little, Palo Alto, CA (US);
MMR Technologies, Inc., Mountain View, CA (US);
Abstract
A cryogenic gas is liquefied using a refrigeration system [] thermally coupled at an evaporator [] to a cold end of a gas supply system [] within a dewar []. The refrigerator has a minimum temperature at an evaporator [] above the boiling point of the gas at atmospheric pressure but below the boiling point of the gas at a high pressure. Thus, the gas is compressed [] to high pressure so it condenses when cooled by the evaporator []. As it expands at a flow restrictor [], a portion evaporates and cools a fraction to the temperature of the boiling point of the gas at atmospheric pressure, producing liquefied gas. Opening a purge valve [] sends warm gas upward through heat exchange section [] and out through a three-way valve [] for defrosting. To reduce clogging, the gas supply valve [] is controlled by a gas purity sensor [