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:
Apr. 23, 1991
Filed:
May. 22, 1990
Atsushi Sugimoto, Aichi, JP;
Osamu Nakano, Aichi, JP;
Shigeru Yasuda, Aichi, JP;
Chikatoshi Maeda, Aichi, JP;
Toshio Ozone, Aichi, JP;
Makoto Kawagoe, Aichi, JP;
Aichi Steel Works, Ltd., Tokai, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Chuo Hatsujo Kabushiki Kaisha, Nagoya, JP;
Abstract
A spring steel having a good durability and a good sag-resistance consisting essentially of by weight 0.35-0.55% carbon, 1.80-3.00% silicon, 0.50-1.50% manganese, 0.50-3.00% nickel, 0.10-1.50% chromium, 0.01-0.05% aluminum and 0.010-0.025% nitrogen, the remainder being iron and inevitable impurities. The spring steel has been completed for the purpose of obtaining a spring steel having a high toughness in a high hardness of not less than HRC 55 and having a good sag-resistance, in particular examining the contents of nickel, chromium and nitrogen in addition to the carbon content.