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:
May. 07, 1991
Filed:
Jan. 29, 1990
Applicant:
Inventors:
Yasuharu Hakamatsuka, Hachioji, JP;
Kazuhiro Watanabe, Hachioji, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B28B / ;
U.S. Cl.
CPC ...
106 383 ; 106 389 ; 501111 ; 501133 ; 433 48 ;
Abstract
The phosphate mold material of this invention comprises refractory materials and binders as principal components, the refractory materials containing cristobalite and quartz, and the binders containing metal oxides which includes magnesia clinker and a phosphate salt. The proportion of said refractory materials to said binders is 80:20-90:10, and the proportion of cristobalite to quartz is in the range 6:1-7:1.