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:
Mar. 15, 2011
Filed:
Mar. 26, 2007
Junichi Ichikawa, Matsudo, JP;
Tomoyuki Kohida, Matsudo, JP;
Kensuke Nakata, Matsudo, JP;
Tomoaki Arakawa, Matsudo, JP;
Junichi Ichikawa, Matsudo, JP;
Tomoyuki Kohida, Matsudo, JP;
Kensuke Nakata, Matsudo, JP;
Tomoaki Arakawa, Matsudo, JP;
Hitachi Powdered Metals Co., Ltd., Matsudo-shi, JP;
Abstract
A sintered gear comprises: plural tooth portion having a tooth flank and a tooth bottom land; a high density area formed over entire surface of the tooth portion, the high density area having a density of 7.6 Mg/mor more and formed with a depth of 1 mm or more from the surface; a low density area formed in deeper area than the high density area, the low density area having a density of 7.3 Mg/mor less; and an intermediate area formed between the high density area and the low density area, the intermediate area having a density gradient in which the density is gradually decreased from the high density area to the low density area.