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2020’s
- 2022
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09Deokyang Co., Ltd changed to Approtium Co., Ltd.
- 2021
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Macquarie Asset Management acquires Deokyang Co., Ltd
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2010’s
- 2018
-
Ulsan Plant 3 hydrogen plant completed
- 2017
-
09Break ground on Deokyang hydrogen chemical plant Onsan.
04Ulsan dry ice factory completed and commence production
- 2015
-
07Headquarters liquified CO2 (LCO₂) Expansion completed
- 2013
-
09Completion of the expansion of the headquarters hydrogen (H2) plant
- 2012
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11Installation operation of hydrogen generator (on-site) (in Incheon Korea Electronic Materials Co., Ltd.)
- 2011
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11Ulsan Hydrogen (H2) plant expansion
07Changed company name to Deokyang Co., Ltd.
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2000’s
- 2008
-
10Recognized by the National Academy of Environmental Sciences as "Standard Gas Testing Standards for Environmental Measuring Instruments"
- 2006
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10Winner of the 1st Ulsan Industry Awards Management Award
09Winner of the Korea Gas Industry Award for Social Contribution
07Expansion of the Seosan Plant Liquid CO2 (LCO2) Manufacturing Plant and Dry Ice Production Started
- 2005
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11Completed construction of the Seosan Plant Liquid CO2 (LCO2) Manufacturing Plant
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1990’s
- 1999
-
12Deokyang Gas Co., Ltd. obtained ISO 9001 certification
- 1997
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08Completion of liquid CO2 gas plant and commencement of production (Ulsan Headquarters)
- 1996
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07Changed company name to Deokyang Gas Co., Ltd.
- 1994
-
11Completion of Seosan Plant
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1980’s
- 1988
-
08Start supply of Byproduct Hydrogen supply via pipeline
- 1986
-
01Laboratory completed, production of high purity (standard/mixed) gas
- 1984
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12Hydrogen plant completed and start of production
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1960~70’s
- 1976
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04Completion of CO2 gas charging station
- 1974
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07Acetylene plant completed
- 1964
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Acquisition of Ulsan Oxygen Independent Management / The year of the company's founding