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. 30, 1977
Filed:
Nov. 14, 1975
Applicant:
Inventors:
Kunio Fujie, Tokyo, JA;
Masaaki Itoh, Tsuchiura, JA;
Tamio Innami, Tsuchiura, JA;
Hideyuki Kimura, Chiyodamura, JA;
Wataru Nakayama, Kashiwa, JA;
Takehiko Yanagida, Chiyodamura, JA;
Assignee:
Hitachi, Ltd., , JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F28F / ; F28F / ; F28F / ;
U.S. Cl.
CPC ...
138 38 ; 138 37 ; 165133 ; 165179 ; 165184 ;
Abstract
A heat transfer pipe for use in a heat exchanger such as air conditioner, freezer and boiler, wherein grooves are formed in the inner wall surface of the pipe, which are by far finer in size than the grooves that have been provided for the purpose of increasing the heat transfer area in general, and slanting relative to the axis of pipe, to thereby improve the heat transfer rate without increasing the pressure loss caused to the fluid flowing through the pipe.