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:
Jan. 08, 2002
Filed:
Dec. 21, 1999
Mamoru Ishikawa, Hatano, JP;
Kiyonori Ozeki, Hatano, JP;
Nobuaki Hinago, Hatano, JP;
Chikara Saeki, Hatano, JP;
Abstract
A tube having a grooved inner surface capable of achieving high condensing performance and high evaporating performance even in a region of a small flow rate of a refrigerant and preferable as a heat exchanger tube for a condenser as well as an evaporator and its fabrication method, wherein spiral groove fabricating zones formed with spiral grooves are arranged at an inner surface of a metal or an alloy tube and intersecting groove fabricating zones formed with intersecting groove groups intersected with pluralities of grooves are arranged at the inner surface of the metal or the alloy tube at regions different from each other, singles or pluralities of the spiral groove fabricating zones and the intersecting groove fabricating zones are alternately arranged in a tube circumferential direction of the metal or the alloy tube, when a fabrication width of the spiral groove fabricating zone in the tube circumferential direction is designated by W and a fabrication width of the intersecting groove fabricating zone is designated by W , a ratio W /W of W to W falls in a range of 1.1 through 3.0 and the ratio W /W can also be made to fall in a range of 0.3 through 0.9.