1919 | Minoji Hashiguchi establishes Kameido rubber factory in Tokyo |
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1920 | Heisen Yoko chemicals division established at Kameido rubber factory with the purpose of importing and selling rubber |
1921 | Contract signed to act as agent for Bayer of Germany |
1924 | Heisen Yoko chemical division established as a joint stock company Active in sales and publicity for Bayer's rubber additives as sole agent in Japan |
1927 | Approved as Asian agent for Bayer's rubber additives Kobe office opened |
1928 | Rubber laboratory opened, along with department for training rubber technicians |
1933 | Heisen Yoko Chemical Division becomes a limited company |
1939 | Rubber research laboratory moved to Tokyo, facilities opened to facilitate development of the domestic rubber trade |
1943 | Chemical imports halted as a result of World War Two: business suspended |
1950 | Imports of Bayer rubber additives resumed after ratification of trade treaty with West Germany Heisen Yoko Co Ltd established and Minoji Hashiguchi becomes managing director |
1955 | Agent for the introduction of Bayer's polyurethane technology, raw material sales begin |
1956 | Kansai sales office opened |
1961 | Minoji Hashiguchi passes away |
1966 | Fully owned subsidiary Koyo Sangyo Co Ltd established |
1973 | Joint venture with Impatex AG of Switzerland, H&K Ltd established, to manufacture polyurethane resin |
1983 | Nagoya sales office established |
1995 | Headquarters moved to Taito Ward in Tokyo |
1998 | Kansai sales office moved from Kobe to Osaka |
2000 | Kyushu branch established in Kita Kyushu City |
2003 | Environmental management system ISO14001 certification obtained |
2011 | Shanghai Rep.Office Opened |
2012 | Shanghai Rep.Office Closed |
Heisen Trading(Shanghai)Co., Ltd. established |