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:
Jul. 13, 1999
Filed:
Oct. 02, 1997
Masakatsu Nishida, Utsunomiya, JP;
Koji Sassa, Utsunomiya, JP;
Tsuyoki Kokubun, Ujiie-machi, JP;
Akio Ishida, Utsunomiya, JP;
Itaru Tamura, Yokohama, JP;
Mitsubishi Steel Mfg. Co., Ltd., Tokyo, JP;
Abstract
A production process of a wax pattern having a core, which is used for casting a product having a complicated hollow portion, comprising the steps of: producing two or more wax shells each having a contour of an external surface of a desired casting; and combining the wax shells with a core to obtain a wax pattern having a hollow portion between the wax shells and the core. Using the method, the occurrence of breakage of the core during dewaxing or production of the pwax pattern is extremely reduced, and a lowering in yield rate due to the breakage of the core is remarkably ameliorated.