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:
Nov. 04, 1997
Filed:
Dec. 12, 1996
Applicant:
Inventors:
Nancy Jean Lynch, North Tonawanda, NY (US);
Dante Patrick Bonaquist, Grand Island, NY (US);
Assignee:
Praxair Technology, Inc., Danbury, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F25J / ;
U.S. Cl.
CPC ...
62646 ; 62924 ;
Abstract
A cryogenic rectification system wherein additional stripping vapor for the lower pressure column of a double column is produced from higher pressure column bottoms and feed for the argon column is taken from the upper portion of the lower pressure column and first processed through a stripping column. Lower purity oxygen is recovered either directly from the lower pressure column or after first being processed in an auxiliary column which additionally produces higher purity oxygen.