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:
Jun. 10, 2025
Filed:
Nov. 27, 2020
MA Aluminum Corporation, Minato-ku, JP;
Toshihiro Harata, Numazu, JP;
Masayuki Nakamoto, Fuji, JP;
Takuya Okawa, Numazu, JP;
Yusuke Nakaura, Mishima, JP;
MA Aluminum Corporation, Minato-ku, JP;
Abstract
An inner spiral grooved tube includes: a tube body; and grooves and fins aligned in an inner circumferential direction of the tube body, wherein the grooves and the fins are formed in a spiral along a longitudinal direction, an outer diameter is 3 mm or more and 10 mm or less, a number of the fins is 30 to 60, made of a metal, a cross sectional shape of each of the fins has a rectangular shape having an apex angle of 0±10°, a ratio h/f is 0.90 or more and 3.40 or less, h being a fin height and f being fin width, a ratio c/f is 0.50 or more and 3.80 or less, c being a fin spacing, and an average of the ratio h/f and the ratio c/f is 0.8 or more and 3.3 or less.