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. 24, 1988
Filed:
Sep. 25, 1986
Applicant:
Inventors:
Masaomi Tomomura, Hitachi, JP;
Tetsuro Haga, Hitachi, JP;
Shunsuke Nogita, Hitachi, JP;
Kiyoshi Ichihara, Kudamatsu, JP;
Takazumi Ishizu, Hikari, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
55 62 ; 55 68 ; 55 75 ; 62 18 ;
Abstract
Nitrogen having purity of 99.9999% or more can be produced continuously by contacting a starting gas mixture comprising 90% by volume or more of nitrogen and 10% by volume or less of oxygen with A-type zeolite package in an adsorption column at an adsorption temperature of -100.degree. to -196.degree. C. to remove oxygen from the starting gas mixture and regenerating A-type zeolite by heating it at a temperature higher than the adsorption temperature.