Radioactive substance containment vessel, and radioactive...

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

Reexamination Certificate

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Details

C250S505100, C220S657000

Reexamination Certificate

active

07462853

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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