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:
Nov. 20, 2007
Filed:
Apr. 07, 2005
Applicants:
Hirotaka Yoshida, Kawasaki, JP;
Michio Sato, Kawasaki, JP;
Yuji Kurokawa, Kawasaki, JP;
Inventors:
Assignee:
Dai-Ichi High Frequency Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H05B 6/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention provides a removing method of a tube. Upon removing a tubeincreased in diameter and fixed to a tube-sheet, an inserted portionwhich is fixed to a tube-holeof the tube-sheetis heated and then cooled, thereby reducing its diameter. The inserted portionis loosened from the tube-hole. Then, a regionopposed to a grooveformed in an inner circumference of the tube-hole is heated to a red-hot state, and the tubeis stretched in its axial direction, the red-heated regionis stretched to reduce its diameter and cut the region, thereby pulling out the tubefrom the tube-sheet