Hitachi, Ltd.

The Japan Carlit Co., Ltd.

Kanto Koatsu

Tsuyoshi Aoyama

Yoshiaki Eguchi

Takahiro Nakano

Junichi Hara

Koji Sonoda

Fusaji Shoji

Takashi Horiuchi

Isao Isa

Nobuo Aoki

Makoto Ebisawa

Yoji Yamaguchi

Shuko Shindo

Jun Kurita

Toshiyuki Kiriyu

Yoshinori Matsuzaki

In a storage system with a server apparatus having at least one CPU, a memory, at least one network interface, and at least one storage interface, and, at least one disk connected to the storage interface, the server apparatus has a snapshot management part which maintains and manages snapshot of the disk apparatus, the disk apparatus has an operational volume which performs ordinary read/write and a differential volume which stores differential data of snapshot of the operational volume, the snapshot management part stores data on the operational volume in the differential volume, provides a preceding copy area to store its location information, and when free area on the differential volume becomes insufficient discards the stored location information and uses the preceding copy area as an free area.

Storage system, server apparatus, and method for creating a plurality of snapshots

Highly pure 3,3',4,4'-biphenyltetracarboxylic acid (BPTA) and dianhydride thereof (BPDA) are produced by heating crude BPTA to give BPDA, treating the BPDA with hot water to give highly pure BPTA, and in the case of highly pure BPDA, heat treating the pure BPTA to give highly pure BPDA.

Process for producing highly pure 3,3',4,4'-biphenyltetracarboxylic acid

A charge transfer complex comprising N,N'-alkylene-di-3,5-lutidine as a donor and 7,7,8,8-tetracyanoquinodimethane as an acceptor, the molar ratio of the acceptor to the donor of the charge transfer complex being between 3.0 and 5.0 has a high melting point and excellent electrical conductivity as an electrolyte for a capacitor. A solid electrolytic capacitor employing said charge transfer complex has reduced current leakage and high temperature load characteristics. A chip-type solid electrolytic capacitor employing said charge transfer complex has reduced current leakage, high temperature load characteristics and excellent thermal stability and life characteristics.

Charge transfer complex and solid electrolytic capacitor employing the

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Shibukawa, Japan

Tsuyoshi Aoyama