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:
Oct. 19, 1999
Filed:
Jun. 18, 1998
Nippon Carbon Co., Ltd., Tokyo, JP;
Abstract
A method of manufacturing split crucible pieces of a multiple-piece crucible comprising an integral assembly of two or more split crucible pieces and having a spherical bottom inner surface. The split crucible pieces are manufactured from a work mass graphite material by mechanical processing, comprising a step of forming a blind annular groove coaxial with the work by cutting the work from an end thereof toward the other end, a step of axially splitting the work into two or more pieces, constituting eventual split crucible pieces, and a step of cutting each split crucible piece from the side thereof opposite the sector-like or polygonal profile surface side by using a spherical acutting means, thereby forming a spherical inner bottom surface.