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:
Dec. 16, 2003
Filed:
Jul. 23, 2002
Takashi Iwamoto, Muroran, JP;
Shinichi Ono, Muroran, JP;
Yukio Sato, Muroran, JP;
Masayuki Kawai, Muroran, JP;
Yasushi Owaki, Muroran, JP;
Masashi Tomiie, Tokyo, JP;
Shunroku Sukumoda, Aizuwakamatsu, JP;
Kohtaroh Nagahara, Aizuwakamatsu, JP;
The Japan Steel Works, Ltd., Tokyo, JP;
Abstract
In a heat transfer pipe, annular grooves in a direction inclined at an angle of 45° to 90° with respect to an axis of the pipe are continuously formed at an interval in a longitudinal direction of the pipe. The annular grooves desirably have a groove depth of 0.20 mm or more, and a groove pitch of two to five times larger than the groove depth. Moreover, a ratio W/P of a bottom width W of projections of the grooves to the groove pitch P is desirably 0.1 to 0.9.