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:
Aug. 21, 1979
Filed:
Apr. 26, 1977
Applicant:
Inventors:
Friedhelm Reinke, Remscheid, DE;
Friedhelm Emde, Huckeswagen, DE;
Assignee:
Aeg-Elotherm, G.m.b.H., Remscheid-Hasten, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D / ; C21D / ;
U.S. Cl.
CPC ...
148150 ; 148152 ; 148153 ;
Abstract
A process in which pipes, particularly thick walled pipes, are inductively heated to the austenization temperature, quenched with a coolant to form martensite in the surface zone, then drawn, with additional heat added when necessary and left to cool with the not-quenched layers forming an interstage structure.