An extension is built. The core piece of the extension is a new gumming machine, which proves to be a very profitable investment in light of the increasing demand for gummed paper.
The URSUS® trademark that is still used today is registered at the German Patent Office. In the 1930's, paper for bookcases and book covers aswell as gummed (coloured) paper were the main sellers.
The business is turned into a limited partnership.
The factory is completely destroyed by several bomb attacks. The private house of the Barthel Family is also attacked during an air raid. Christian Barthel (Senior) dies shortly afterwards and leaves behind his wife Margarete and three sons. Aid from colleagues at the emery paper works C. F. Schröder in the nearby town of Hann. Münden enables the coloured paper company to make a new start with its own staff in foreign surroundings. A small group of customers is established which lays the foundations for the reconstruction of the company.