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. 22, 1995
Filed:
Sep. 17, 1991
Osamu Isshiki, Hitachi, JP;
Masaki Murashita, Hitachi, JP;
Osamu Matsushima, Hitachioota, JP;
Sadao Nakagawa, Hitachi, JP;
Seizo Nakano, Mito, JP;
Koji Goto, Hitachi, JP;
Masayoshi Hashiura, Hitachi, JP;
Yutaka Kobayashi, Hitachi, JP;
Takashi Satoh, Hitachi, JP;
Katsuro Ota, Hitachi, JP;
Hideaki Kikuchi, Hitachi, JP;
Takashi Sato, Kitaibaraki, JP;
Shinji Fukuda, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A method for manufacturing a welded metal container by first arc welding a branch pipe to a trunk pipe. The arc welding of the pipes together causes both of the pipes to be thermally deformed. The end surfaces of the pipes are then cut by a laser cutting or mechanical cutting process so that the ends of the trunk pipe are in parallel and perpendicular to the end of the branch pipe. Subsequently flanges are laser welded to the ends of the pipes without further thermally deforming the pipes. The metal container made by this process can be used as a sheath for a gas insulated switch gear.