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:
Feb. 14, 2012
Filed:
Dec. 30, 2008
Junichi Higuchi, Nishinomiya, JP;
Kenji Hamaogi, Sakae-machi, JP;
Junichi Higuchi, Nishinomiya, JP;
Kenji Hamaogi, Sakae-machi, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Abstract
A metal tube in the present invention is a metal tube for pyrolysis reaction with superior characteristics of both the heat exchange and the pyrolysis reaction, which is suitable for use in a process in which hydrocarbons are pyrolytically decomposed. The tube is a metal tube for pyrolysis reaction consisting of 3 or 4 spiral ribsprovided on an inner surface which are inclined at 20 to 35 degrees to an axial direction of the metal tube, and characterized in that h/Di of 0.1 to 0.2 and h/w of 0.25 to 1.0 when a height of the ribis defined as 'h', a width of the ribat its bottom part is defined as 'w' and an inner diameter of the tube at the bottom part is defined as “Di” in cross section of the spiral rib