1992. 7. 20 Founding AhJin construction(Seoul     Gwanak-gu Sindorim-dong)
2007. 11 Delivery the patented waterproof sheets for Talratona Convention Hotel in Angola(namgwang construction)
2008. 3 Asphalt waterproofing sheet and method(using butyl rubber or polyvinyl butyl)
Korea Patent No. 10-0814087
2008. 3 Change the company name to "AHJIN LAYER"
2008. 3 Manufacturing unit for Asphalt waterproofing sheet  
Patent No. 10-0814945
2008. 6 Move to Bucheon Gyeonggi
2008. 6 Delivery the Patents waterprooping sheet for Mirmar 3Tower in Angola(namgwang construction)
2008. 7 Trademark registration number : 40-0734546
2008. 9 Delivery waterproofing materials for roof of Bucheon Sosa the National Sports Center
2009. 1 Utility Model Patent
(Application No. 0000194)
2010. 1 Self sticking asphalt waterproofing sheet and new method using the sheet Korea Patent No. 10-0940350
2009. 2 AHJINLAYER Co Ltd (Corporate Registration
2010. 6 Register Venture Company

Applicated new construction Technology to Ministry of Land Application.
Apply materials to field with Samsung and many other major construction.

Selected Newdeal policy company by Buchoen.
2011. 1 Recognition R&D department
2011. 2 Selected e-trade support project in Buchon
2011. 2 Participated in Kyung Hyang Housing Fair Exhibition
2011. 3 Presentation to SK Engineering & Construction Headquarters and field staff relative