Valdemar Ludvigsen

After returning to Denmark in 1887, he partnered with Wilhelm Hellesen who had just obtained a patent on a dry cell battery. In rented premises at Blågårdsgade, Hellesen and Ludvigsen continued to work on the invention. After Hellesen's death, it was commercialized by Ludvigsen and Hellesen's widow as Hellesens Enke / V. Ludvigsen. In 1896 Lidvigsen succeeded in finding the composition of the electrolyte paste that conditioned its durability.^[2]

In 1906, Ludvigsen became the sole owner of the company. In 1918, it was converted into a limited company as Hellesens Enke & V. Ludvigsen A/S. Ludvigsen remained chairman of the board until his death in 1939. A new factory was constructed at Aldersrodgade in the same year.

Æudvigsen married on 2 May 1891 in Copenhagen to Amalie Eggertine Prætorius (1869-1933). She was a daughter of navigation teacher Hans Vilhelm Prætorius (1828–1902) and Eggertine Sophie Frederikke Amalie Wellejus (1843–97).^[1]

Ludvigsen owned a large villa at Svanemållevej 41 in Copenhagen's fashionable Ryvangen neighbourhood. The house was constructed for him to designs by the architect Carl Brummer. In 1913, he purchased Holtumgårde with Holtumbjerg Plantage at Arnborg. In 1927, he also purchased Østrupgård at Fåborg.^[3]

Ludvigsen was an honorary member of the Danish Scouts Corps and the Royal Danish Automobile Club.

In 1900, he was appointed as Guatamalen consul in Copenhagen. 1926 saw him appointed as consul-general. He was a member of the Royal Danish Academy of Science and Technology. He was created a Knight of the Order of the Dannebrog in 1913 and was awarded the Cross of Honour in 1937.^[1]