Radioactive substance container, manufacturing apparatus...

Radiant energy – Radiation controlling means – Shielded receptacles for radioactive sources

Reexamination Certificate

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C250S518100, C376S272000

Reexamination Certificate

active

11010351

ABSTRACT:
In the metal billet to be used for hot dilation forming, a forward side with respect to the pressing direction has a quadrate section and its diagonal length is not more than an inner diameter of a container. Moreover, a backward side with respect to the pressing direction has a circular section and its diameter is substantially same as the inner diameter of the container. The metal billet is heated to a temperature suitable for press working and is set into a container for press forming. While a center of a workpiece of the metal billet is being bored by a boring punch to be operated by a pressing machine, the metal billet is hot-dilated so that a bottomed container for a cask is formed.

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patent: 5567952 (1996-10-01), Kirchner et al.
patent: 6325194 (2001-12-01), Thomire
patent: 6625247 (2003-09-01), Ohsono et al.
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patent: 03-106532 (1991-05-01), None
patent: 2000-9897 (2000-01-01), None
patent: 2001-0832810 (2001-03-01), None
patent: WO 99/66226 (1999-12-01), None

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