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. 23, 2001
Filed:
Jul. 13, 1999
Yukio Kuramasu, Shizuoka-ken, JP;
Takaaki Ikari, Shizuoka-ken, JP;
Nippon Light Metal Co., Ltd., Tokyo, JP;
Abstract
After a cavity,of a die-casting mold,is evacuated to exclude gases, oxygen gas is blown into the cavity,until an internal pressure of the cavity exceeds the atmospheric pressure, and then a molten metal,is forcibly injected into the cavity,The cavity,is evacuated to a degree of vacuum less than 100 millibar through a suction nozzle,The oxygen gas is blown through a nozzle,into the cavity,so as to fill the cavity,with the oxygen gas at an internal pressure higher than the atmospheric pressure. When the molten metal,is injected into the cavity,clarified in this way, inclusion of gases is perfectly prohibited. As a result, obtained die-cast products are free from defects such as blowholes or porosity caused by inclusion of gases and so useful as functional members as well as structural members.