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:
Jul. 14, 2009
Filed:
Nov. 28, 2005
Toshinobu Nishibata, Nishinomiya, JP;
Masahiro Nakata, Nishinomiya, JP;
Shuntaro Sudo, Toyota, JP;
Akira Obayashi, Toyota, JP;
Masanobu Ichikawa, Nisshin, JP;
Toshinobu Nishibata, Nishinomiya, JP;
Masahiro Nakata, Nishinomiya, JP;
Shuntaro Sudo, Toyota, JP;
Akira Obayashi, Toyota, JP;
Masanobu Ichikawa, Nisshin, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Toyoda Iron Works Co., Ltd., Aichi, JP;
Abstract
A hot press-formed member having stable strength and toughness is manufactured from a high strength steel sheet by hot press forming. In the cooling stage during hot press forming, the cooling rate is at least the critical cooling rate until the Ms point is reached and it is then in the range of 25-150° C./s in the temperature range from the Ms point to 200° C. The Vickers hardness of the hot pressed member is less than the value of (maximum quenching hardness—10) and at least the value of (maximum quenching hardness—100).