| 1927-04 |
1927年（昭和2年4月） : 創業者北村勇個人商店北村溶剤化学製品所設立（大阪市福島区） |
| 1928-04 |
April 1928 (Showa 3): Construction of lacquer/shellac manufacturing plant |
| 1933-04 |
April 1933 (Showa 8): Reorganized Kitamura Solvent Chemical Products into a limited partnership |
| 1933-04 |
April 1933 (Showa 8): Establishment of Isamu Pharmaceutical Plant (Sagisu, Fukushima-ku, Osaka) |
| 1942-11 |
November 1942 (Showa 17): Factory closure due to the Industrial Reorganization Order |
| 1945-06 |
June 1945 (Showa 20): Factory completely destroyed in the Great Osaka Air Raid |
| 1946-09 |
September 1946 (Showa 21): Resumption of operations in Minami-horie, Nishi-ku, Osaka |
| 1947-07 |
July 1947 (Showa 22): Establishment of Rose Color Industrial Co., Ltd. (Nishi-ku, Osaka) |
| 1948-01 |
January 1948 (Showa 23): Reestablishment of factory at 1-6 Kami-Sagisu, Fukushima-ku, Osaka (reestablishment of Kitamura Solvent Chemical Products limited partnership) |
| 1949-10 |
October 1949 (Showa 24): Name change to Kitamura Solvent Chemical Products Co., Ltd. (the limited partnership Kitamura Solvent Chemical Products absorbed Rose Color Industrial Co., Ltd.) |
| 1955-03 |
1955年（昭和30年3月） : 名古屋出張所開設（名古屋市中区） |
| 1955-07 |
July 1955 (Showa 30): Renamed to Isamu Coatings Co., Ltd. |
| 1955-07 |
1955年（昭和30年7月） : 東京出張所開設（東京都墨田区） |
| 1956-02 |
1956年（昭和31年2月） : 本社移転（大阪市福島区鷺洲） |
| 1956-10 |
1956年（昭和31年10月） : 名古屋出張所移転（昭和区円上町） |
| 1957-02 |
February 1957 (Showa 32): Headquarters factory designated as JIS-certified factory |
| 1958-03 |
March 1958 (Showa 33): Establishment of Isamu Land and Building Co., Ltd. (Sagisu, Fukushima-ku, Osaka) |
| 1958-09 |
1958年（昭和33年9月） : 九州工場開設（福岡市西区姪浜） |
| 1959-05 |
1959年（昭和34年5月） : 東京工場開設（東京都板橋区）東京出張所（墨田区）廃止 |
| 1961 |
1961 (Showa 36): Tokyo factory designated as JIS-certified factory |
| 1961-09 |
September 1961 (Showa 36): Establishment of Isamu Model Paint Co., Ltd. (Sagisu, Fukushima-ku, Osaka) |
| 1962-11 |
November 1962 (Showa 37): Nagoya Factory opened (Komohara-cho, Nishi-ku, Nagoya City). Nagoya Branch Office (Enjō-cho, Showa-ku) closed. |
| 1965-09 |
September 1965 (Showa 40): Shiga Factory completed (Nojo-cho, Kusatsu City, Shiga Prefecture). |
| 1966-03 |
1966年（昭和41年3月） : 大阪工場開設（大阪市淀川区三津屋南） |
| 1967 |
World's first acrylic urethane resin paint 'HiArt' |
| 1967-06 |
June 1967 (Showa 42): Isamu Aerosol Industry established (Sakisu, Fukushima-ku, Osaka City). |
| 1970-01 |
January 1970 (Showa 45): Shiga Factory designated as JIS standard certified factory. |
| 1972-02 |
February 1972 (Showa 47): Sendai Branch Office opened (Sendai City, Miyagi Prefecture). |
| 1974-09 |
1974年（昭和49年9月） : 「進勇商事株式会社」設立（大阪市福島区鷺洲） |
| 1975 |
Fast-drying super acrylic urethane 'Uniatron' |
| 1975-08 |
August 1975 (Showa 50): Publication of 'Saikun 70 Years: The Path I Walked' by Yū Kitamura. |
| 1975-09 |
1975年（昭和50年9月） : 仙台出張所移転（仙台市青葉区） |
| 1976-09 |
September 1976 (Showa 51): Shiga Factory obtained JIS (building materials division) approved factory status. |
| 1977-05 |
May 1977 (Showa 52): Meiyu Color Co., Ltd. established (Nojo-cho, Kusatsu City, Shiga Prefecture). |
| 1977-09 |
September 1977 (Showa 52): Isamu Headquarters Building completed (Sakisu, Fukushima-ku, Osaka City). |
| 1978-06 |
1978年（昭和53年6月） : 中国出張所開設 |
| 1978-08 |
August 1978 (Showa 53): Founder Yū Kitamura passed away. |
| 1981-08 |
1981年（昭和56年8月） : 中国出張所移転（広島市西区己斐） |
| 1984 |
The pinnacle of fast-drying acrylic urethane 'AU21' |
| 1984-03 |
March 1984 (Showa 59): Listed on the Osaka Stock Exchange Second Section (Special Designated Stock). |
| 1989 |
Dual-curing balanced urethane 'Ureta88' that balances finish and workability |
| 1990-01 |
January 1990 (Heisei 2): Kyushu Factory new headquarters completed and relocated to Kusaya District, Fukuoka Prefecture (former Kyushu Factory: Nishi-ku, Nijo-hama closed). |
| 1991-04 |
1991年（平成3年4月） : 横浜出張所開設（横浜市南区） |
| 1991-05 |
1991年（平成3年5月） : 札幌出張所開設（札幌市厚別区） |
| 1992 |
Industry first single-component urethane and coating revolution 'Milano 2K Reactor M Series' |
| 1992-11 |
November 1992 (Heisei 4): Nagoya Factory new headquarters completed (Komohara-cho, Nishi-ku, Nagoya City). |
| 1995 |
1995年（平成7年） : 広島出張所移転（広島市西区中広町） |
| 1995-03 |
March 1995 (Heisei 7): Sendai Branch Office relocated to Izumi-kyō, Izumi-ku, Sendai City. |
| 1996-03 |
March 1996 (Heisei 8): Factory operating as a sales base converted to a branch office; China Branch Office renamed Hiroshima Branch Office. |
| 2000-05 |
May 2000 (Heisei 12): Shiga Factory new plant completed and relocated to Kasaya, Kusatsu City (former Shiga Factory: Nojo-cho, Kusatsu City closed). |
| 2000-05 |
May 2000 (Heisei 12): Shiga New Plant obtained simultaneous ISO 9001 and ISO 14001 certification. |
| 2002-06 |
June 2002 (Heisei 14): Nagoya Branch obtained ISO 14001 certification. |
| 2003-08 |
August 2003 (Heisei 15): Osaka Branch and Tokyo Branch obtained ISO 14001 certification. |
| 2004-06 |
June 2004 (Heisei 16): Fukuoka Branch obtained ISO 14001 certification. |
| 2004-11 |
2004 (November 2014): Completion of new Tokyo branch office, relocation to Todai City, Saitama Prefecture (former Tokyo branch: abolished in Itabashi Ward) |
| 2004-11 |
2004 (November 2014): Closure of Yokohama branch office and integration into Tokyo branch |
| 2009-07 |
2009 (July 2019): Completion of new Sendai branch office, relocation to Miyagino Ward, Sendai City (former Sendai branch office abolished) |
| 2009-12 |
2009 (December 2019): Transfer of Shinyu Trading Co., Ltd. to Mitsuya, Yodogawa Ward, Osaka City |
| 2010-04 |
2010 (April 2010): Renaming of Hiroshima branch office to Hiroshima Representative Office |
| 2010-12 |
2010年（平成22年12月） : 大阪支店新事務所移転（大阪市淀川区三津屋） |
| 2011-12 |
2011年（平成23年12月） : 本社新社屋竣工（大阪市福島区鷺洲） |
| 2013-07 |
2013 (July 2013): Listed on Tokyo Stock Exchange Second Section due to consolidation of the physical market |
| 2014-04 |
2014 (April 2014): Completion of new color adjustment center and PS House at Shiga factory |
| 2015-06 |
2015年（平成27年6月） : 広島駐在所移転（広島市中区） |
| 2025-05 |
2025 (May 2025): Opening of the 'Safety Dojo', a simulated experience facility aimed at fostering sensitivity to workplace accidents, at Shiga factory |
