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. 06, 1981
Filed:
Apr. 17, 1979
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23B / ;
U.S. Cl.
CPC ...
106 383 ; 106 3835 ; 106 389 ; 164 15 ;
Abstract
Particulate material for forming molds produced by mixing particulate refractory material with one material selected from the group consisting of colloidal silica, colloidal alumina, colloidal zirconia and ethyl silicate, drying the mixture and allowing same to set, and crushing the dried mixture into particulate form again. The particulate material includes refractory particles provided with a coat of silica or alumina or zirconia on the surface and increases the strength and surface precision of a mold.