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. 07, 2002
Filed:
Feb. 22, 2000
Applicant:
Inventor:
Hans-Peter Schmidt, Mettmann, DE;
Assignee:
Messer Griesheim GmbH, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B05C 1/100 ;
U.S. Cl.
CPC ...
B05C 1/100 ;
Abstract
Disclosed is a method for joint oxydation and heat treatment of workpieces at temperatures ≦1300° in the treatment chamber of an oven containing a neutral or reactive gas in a temperature range above 570°. In order for the process to be reproducible and to produce homogeneous oxide layers, the PH O/PH ratio is adjusted after transformation of the workpiece structure such as found at the ambient temperature into the structure wanted during the heat treatment in such a way that the line FeO+H =Fe+H O is exceeded and an oxide layer is formed from FEO<10 &mgr;m.