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:
Dec. 18, 1990
Filed:
Jan. 19, 1990
Applicant:
Inventors:
Maurice Grenier, Paris, FR;
Philippe Mazieres, Montfermeil, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F25J / ;
U.S. Cl.
CPC ...
62 22 ; 62 24 ; 62 31 ; 62 27 ; 62 44 ;
Abstract
Oxygen from the bottom of a low pressure column (4) is purified from hydrocarbons in a first auxiliary column (12), and the vapor at the top of this column is distilled in a second auxiliary column (17) heated at the base thereof with air at medium pressure. Ultra-pure oxygen is produced at the bottom of the second auxiliary column. Application in the production of ultra-pure oxygen for the electronic industry.