The Ott family breathed new life into the business. Ernst Eckert, a descendant of the Ott family, took up the reins and lead the company to what it is today. While talking about the VPFN, Ernst's son Adolf, noticed that it was not fun pronouncing the whole name, and most people would forget what it is. In search for a new name, Adolf employed a very simple method, he abbreviated it even shorter to V.N and pronounced it as a word. The German pronunciation of the letter V(vau) and the letter N (en) thus in 1909 the name changed to VAUEN. Two years later in 1911 Adolf Eckert again provided the company with an ingenious idea, of a very simple trademark.
In the 1920s, Vauen attempted to apply to trademark their white dot on the mouthpiece, unfortunately for them Dunhill was already implementing the same white dot for the pipes the produced for the international market. The court played out in favour towards Dunhill, resulting in them using the white dot internationally, while VAUEN may only mark their pipes in Germany and Austria with a white dot. As a result, VAUEN marks their highest quality pipes with other colours for the international market. The white or coloured dot denotes the higher quality pipes of VAUEN;
Only a year after the legal battle, Vauen introduced pipes with space for a removable paper filter. Perhaps after World War One, and its increase in cigarette smoking, Vauen attempted to offer a more healthy smoke, via the filter. This "healthier" pipe was a big hit, and the company continued to produce a carbon filter, which they sold under the name Dr. Perl junior activated carbon filters, which came into play in 1934.
The carbon filters were working better, but it had not yet caught on, their advertising campaign brought in the sales with the slogan "Ein heller Kerl raucht nur die echte Dr. Perl!" i.e. "A bright chap smokes only the real Dr. Perl!" This began a booming of pipe smokers seeking pipes with the option of a filter. Today more than 90% of pipes produced in Germany have the option for a 9mm filter, and, of course, the majority of those filters are made by Vauen, which sell around 150 million filters annually.
During World War II, the German tobacco industry suffered greatly under Adolf Hitlers anti-tobacco campaigning. With propaganda posters claiming "German's do not smoke!" The pipe industry took a big hit, but all the same after 1945, Adolf Eckert's son Ernst Eckert, brought the companies head above water. Unlike the majority of pipe companies, Vauen was not bought out even during the hard times of the wars.
http://www.vauen.de/en/the-company/the-company.aspx
http://www.tobaccopipes.com/vauen-history/