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. 25, 2000
Filed:
Oct. 08, 1998
Applicant:
Inventors:
Yutaka Hadano, Hoi-gun, JP;
Shigeaki Yamamoto, Toyohashi, JP;
Assignee:
Sintokogio, Ltd., Nagoya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B28B / ; B22C / ; B22C / ;
U.S. Cl.
CPC ...
106 389 ; 106 3827 ; 106 383 ; 106482 ; 106485 ; 106486 ; 164349 ;
Abstract
A process for preparing a molding sand for a green sand mold is provided. The process comprises the step of drying under a reduced pressure of 0 to 0.3 atm for 0.5 to 30 seconds a green molding sand obtained by kneading silica sand, clay, and water, to dry the clay superficial part and to retain in a moist state the clay deeper part on the silica sand core part in each particle of the molding sand. The molding sand prepared by this process has enhanced flowability. Furthermore, the sand mold prepared from the molding sand has sufficient strength.