1878
Wilhelm Wirz founded the company

1919
Peter Jansen takes over the company and calls it Wirz Nachfolger P.A. Jansen

1922
Ahrweilit Filler is registered as a patent at Reichspatentamt

1922-1964
In spite of the inflation and the currency reform as well as the Second World War and its consequences P.A. Jansen developed into a safe and well-known company of the German lacquer industry.

1964
Death of Peter Jansen
Käthe Wagner, daughter of Peter Jansen, succeeds in office

1974
The company name is changed into P.A. Jansen GmbH u. Co., KG
Three daughters of Käthe Wagner become limited partners of the company

1978
Company anniversary: 100 years of Jansen lacquers

1990
Implementation of an integrated management system to ensure industrial safety and environmental protection

1997
75 years of Ahrweilit Filler

2002
Update of the company's Corporate Design

Death of Käthe Wagner
The daughters Astrid Leu, Ingrid Mayer and Margit Wiener become the new joint proprietors - the company remains in the possession of the family. 

2003
Celebration of 125 years of Jansen

2003-2009
Extensive recontruction and reorganisation of the production plant

2004
Expansion around the business line "isolating colours"

2006 - 2008
Early re-adjustment of solvent-reduced formulations

2011
Focusing on special products for painters