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:
Jun. 27, 1995
Filed:
May. 27, 1994
Horst Corduan, Puchheim, DE;
Hartwin Lindner, Geretsried, DE;
Linde Aktiengesellschaft, Wiesbaden, DE;
Abstract
For extracting argon, air is separated in a rectifying system comprising at least one air separating column and one crude argon column. An argon-containing oxygen fraction is taken from the air separating column and is introduced into a crude argon column. In the upper area of the crude argon column, a crude argon fraction is removed and a first reflux liquid is charged. A first residual fraction is taken from the lower area of the crude argon column. The crude argon fraction is introduced into the lower area of a semipure column. In the upper area of the semipure column, an argon fraction is taken which has reduced oxygen, and a second reflux liquid is charged. From the lower area of the semipure column, a second residual fraction is taken which forms the first reflux liquid for the crude argon column.