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:
Sep. 07, 1993
Filed:
Nov. 06, 1990
Applicant:
Inventors:
Haruo Tateno, Kiyose, JP;
Akira Bunya, Ichikawa, JP;
Susumu Matsuno, Ichikawa, JP;
Akira Nakamura, Tokyo, JP;
Hiroshi Saitoh, Funabashi, JP;
Tsutomu Itoh, Musashino, JP;
Hideo Nagasaka, Tokyo, JP;
Assignee:
Onoda Cement Co., Ltd., Onoda, JP;
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
21912151 ; 21912152 ; 2191215 ; 21912148 ;
Abstract
A plasma gas is injected from a vortex flow forming hole defined to an insulator in a tangential direction with respect to the circumference of the arc column of a torch to enable the axis of the arc column to be aligned with the axial of the torch and a vortex annular gas sheath is coaxially formed to thereby narrow down a plasma flame. Further, the torch comprises the above insulator and a casing which are connected in series each other.