| 1969 | Jun. | Maruzen Oil Co., Ltd.'s Research Center is relocated from Shimotsu, Wakayama, to Satte, Saitama. |
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| 1986 | Apr. | With the establishment of Cosmo Oil Co., Ltd., Cosmo Oil Research & Development Center is opened in Satte, Saitama, through the merger of Daikyo Oil Technology Research Center (Yokkaichi), Daikyo Oil Yokohama Research Center (Yokohama), and Maruzen Oil Research Center (Satte). |
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| 1988 | Jan. | The Cosmo Oil Research & Development Center, along with Cosmo Ventures Co., Ltd.’s Research and Study Department and Development Research Center, are consolidated, merged, and spun off as Cosmo Research Institute Co., Ltd. The institute is subsequently renamed Cosmo Research & Development Center. |
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| 1998 | May. | A method for the industrial production of 5-aminolaevulinic acid (ALA) by fermentation is developed. |
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| Jul. | Cosmo Oil Lubricants Co., Ltd. is established as the Cosmo Group's dedicated lubricants company. The Research & Development Center's Lubricating Oil Division is transferred and reorganized as Cosmo Oil Lubricants Research & Development Laboratory. |
| 2001 | Jun. | Cosmo Research Institute's Research & Development Department is transferred to Cosmo Oil and renamed Cosmo Oil Research & Development Center. |
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| 2002 | Aug. | A catalyst for producing liquid fuels from natural gas (Gas-to-Liquid; GTL) is developed. |
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| 2003 | Apr. | A technology to reduce the volume of excess sludge generated at refineries is developed. |
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| 2004 | Apr. | An ultra-deep desulfurization catalyst for producing sulfur-free diesel is developed. |
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| 2015 | Oct. | With the transition to a holding company structure, Cosmo Oil assumes responsibility for the Petroleum Refining Business. The Research & Development Center continues as the Company’s research and development base. |
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| 2019 | Jun. | The Research & Development Center in Satte celebrates its fiftieth anniversary. |
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| 2021 | May. | Innovation Square is established. |
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| 2022 | Nov. | Verification testing of a new sludge volume reduction technology is completed. |
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| 2023 | Apr. | A comprehensive study on the joint development of technologies for ensuring the stable supply of next-generation energy is initiated with Kyoto University. |
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| 2024 | Mar. | Cosmo Oil's research function is consolidated into the Research & Development Center. |
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| Jun. | A project to validate the integration of solar power generation with storage battery systems is initiated. |
| Jul. | A joint demonstration experiment for film-type perovskite solar cells is launched. |
| 2025 | Aug. | A zero-carbon electricity feasibility demonstration project using solar carports equipped with renewable energy and electric vehicle (EV) charging equipment is commenced. |
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