History
| 1926 | March | Takagi Silver Nitrate Pharmaceuticals, Ltd. established in Oimachi, Shinagawa-ku, Tokyo with capital of 25,000 yen. Production of silver nitrate started. |
|---|---|---|
| 1935 | October | Factory transferred to Komae-shi. |
| 1942 | February | Renamed Toyo Chemical Industrial Co., Ltd. |
| 1963 | December | Capital increased to 15 million yen. |
| 1973 | April | Full-capacity production of silver cyanide, potassium silver cyanide and other silver salts started. |
| 1979 | June | Production of palladium chloride started. |
| 1987 | November | Award presented by the head of the Tokyo Regional Bureau of International Trade and Industry, for the factory’s excellence in the implementation of industrial standards and quality control. |
| 1989 | July | Capital increased to 30 million yen. |
| 1990 | September | Construction of Isehara Factory, located in the industrial complex in Isehara-shi, Kanagawa, completed. |
| 1991 | January | Production of tetraammine palladium (II) chloride started. |
| 2000 | December | Capital increased to 60 million yen. |
| 2001 | June | Acquires ISO 9001. |
| 2005 | August | Acquires ISO 14001. |
| 2015 | April | Construction of new building completed at Isehara Factory. |
| 2024 | May | Technology Development Center closed. Isehara 2nd Factory completed. |