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:
Apr. 10, 1990
Filed:
Apr. 24, 1989
Applicant:
Inventors:
Moritoshi Nagasaka, Ibaragi, JP;
Kikuo Terayama, Ikeda, JP;
Toshihiko Okada, Takatsuki, JP;
Masanobu Uchida, Suita, JP;
Hirokazu Kubo, Takatsuki, JP;
Assignee:
Daihen Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
21912151 ; 21912154 ; 21912149 ; 219 75 ;
Abstract
A plasma arc working apparatus of water cooling type provides a circulation system for circulating cooling water through a circulation passage in order to cool a working plasma arc torch and an introduction device for introducing pressurized gas into the circulation passage in order to drain the cooling water remaining in the circulation passage forcibly therefrom when the power switch for supplying electric power to the working apparatus is switched off.