| 1986 | Formation by Dipl.-Ing. K. Hotz. Since then continous growth. |
| 2000 | Accession and taking-over of management by Dr.-Ing. Ch. Heusch. |
| 2001 | Opening of the branch offices in Sargans and accession of Dr. T. Müller who becomes head of the new Sargans branch offices. |
| 2001 | Dr. iur. A. Rosenkranz becomes head of the trademarks and legal department. |
| 2005 | Formation of the OK pat Ltd, Munich. |
| 2006 | Accession of Dipl.-Ing. Z. Gyenge |
| 2007 | New assistance and accession by Dr. rer. nat S. Bonneick |