| 1934 | Okitsumo starts to research the manufacturing of lacquer and starts to sell it. |
| 1945 | "Mie Yushikakou Incorporated" (previous company name) is established. |
| 1957 | Starts to commercialize heat resistant paint "Okitsumo" and starts to sell it. |
| 1964 | Shigeji Yamanaka, Okitsumo's president (at the time), passes away |
| 1987 | The company name is renamed to "Okitsumo Incorporated" and also renewed the logo design. |
| 1990 | Completion of current main office company building. |
| 1992 | Cable television provider, "Nabari 21 Century Cable Television Incorporated" is set up. |
| 1994 | "Okitsumo USA Incorporated" is established in U.S.A. |
| 1996 | "Okitsumo International (Asia) Co., Ltd." is established in Thailand. |
| 1998 | Registers for "International Quality Management System Standard ISO 9001." |
| 1999 | Registers for "International Environment Management System Standard ISO 14001." |
| 2000 | Katsutoshi Yamanaka takes office as chief executive officer and top manager. Joining with TOTO LTD., a company involving photocatalyst business "Japan Hydrotect Coatings Incorporated," is established. |
| 2001 | "Okitsumo Distribution Incorporated" is established. |
| 2002 | Shigeharu Yamanaka takes office as president. |
| 2003 | "Zhongshan Okitsumo Co., Ltd." is established in China. |
| 2004 | "Nabari 21 Century Cable television Incorporated" is renamed to "Advanscope Incorporated." |
| 2005 | "Zhongshang Okitsumo Co.,LTD. Shanghai Office" is established in Shanghai. |
| 2006 | "Okitsumo International (Asia) Co.,LTD. Bangkok Office" is established in Bangkok. |
| 2006 | Okitsumo Incorporated is chosen as one of the "300 Japan's Dynamic Monodzukuri SMEs" by the Ministry of Economy and IndustryESmall and Medium Enterprise Agency. |