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. 07, 1993
Filed:
Dec. 05, 1988
Applicant:
Inventor:
Jan-Olof Olsson, Hallstahammar, SE;
Assignee:
Kanthal AB, Hallstahammar, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F28F / ;
U.S. Cl.
CPC ...
165133 ; 373127 ; 165904 ;
Abstract
Heat radiation tubes for furnaces and the like heating devices, mainly for industrial processes. Heating can be obtained by electrical heating elements or by combustion for example of gas. The radiation tube is a circular tube having end walls, flanges etc. as required. The radiation tube is a seam-less tube made from iron-chromium-aluminum thereby greatly reducing oxide spalling and enhancing strength thereof at high temperatures. Preferably the tubes are made by extrusion whereby conditions are chosen to provide a rough surface with grooves and ridges which further improves the adhesion of the oxide layer.