| October 1958 |
Nippon Denkai, Ltd. was established in Kyoto by three corporations, Hitachi, Ltd., Sumitomo Bakelite Co., Ltd., and Kosoku Denki Chuzo Co., Ltd. |
|---|---|
| December 1958 |
Began the research and development of electrodeposited copper foil for printed circuit boards. |
| July 1961 |
Established a new plant in Shimodate-shi (currently Chikusei-city), Ibaraki Prefecture. |
| January 1983 |
Established a new plant in Fujieda-city, Shizuoka Prefecture. |
| October 1984 |
Established a second plant (current head office) in Shimodate-city, Ibaraki Prefecture. |
| November 1985 |
Closed Kyoto Plant |
| 1989 | Began the sales of electrodeposited copper foil for IC substrate. |
| 1996 | Began the sales of electrodeposited copper foil for LIB negative current collector. |
| June 1998 |
Began the sales of electrodeposited copper foil for LIB. |
| 1999 | Began the sales of electrodeposited copper foil for EMS of PDP. |
| January 2002 |
Moved the head office to Shimodate-city, Ibaraki Prefecture. |
| September 2002 |
Closed Fuijeda Plant. |
| December 2002 |
Began the sales of electrodeposited copper foil for super fine FPC. |
| June 2006 |
Began the sales of ultra-thin copper foil with carrier. |
| November 2012 |
Began the sales of high tensile strength copper foil. |
| July 2016 |
Stockholder change: MSD Investments Ltd. acquired Nippon Denkai, Ltd. |
| June 2018 |
Increased the manufacturing lines for EV battery copper foil. |
| October 2019 |
Nippon Denkai, Ltd. was merged into Nippon Denkai Holdings Ltd., and changed the trade name to Nippon Denkai, Ltd. |
| March 2020 |
Acquired Oak-Mitsui Inc., a copper foil manufacturer in the U.S., and changed the trade name to Denkai America Inc. |
| June 2021 |
Listed on the Tokyo Stock Exchange Mothers.(Now:Growth since April 2022) |
| May 2023 |
Completed construction of a copper foil production line for automotive batteries in the Camden plant of Denkai America Inc. |
| January 2024 |
Signed a BUSINESS AND CAPITAL ALLIANCE AGREEMENT with LCY Technology Corporation and Lee Chang Yung Group International Pte. Ltd. |
| June 2024 |
Signed a CAPITAL AND BUSINESS ALLIANCE AGREEMENT with Tex Technology Inc. |
| September 2024 |
Signed a Technology License and Support Agreement with Hindalco Industries Limited. |
| November 2024 |
Petition for Commencement of Civil Rehabilitation Proceedings Filed with the Tokyo District Court. |
| December 2024 |
The Tokyo District Court ordered the commencement of civil rehabilitation proceedings. Delisting from the Growth Market of the Tokyo Stock Exchange. |
| March 2025 |
Concluded a Business Transfer Agreement with MUSTI ONE Ltd. |
| August 2025 |
Trade name changed to Chikusei Sangyo , Ltd. |