However, the turmoil of war did not impair his engineering ambitions. From 1952 until 1954, Fritz Karl Preikschat submitted five patents for his invention of a teleprinter with seven print wires for a 7×5 dot matrix. In 1956, his employer, the Telefonbau und Normalzeit GmbH (TuN) offered the device to the German Federal Post Office, which showed no interest.
In 1957, Fritz Karl Preikschat emigrated to the US and continued his career as an engineer in the aerospace sector. Several further inventions paved his way, including a blind-landing system for airports, a phased array system for satellites, a new moisture meter, a hybrid car system and a particle-size analyzer. At the age of 83, Fritz Karl Preikschat died in Kirkland, Washington.
It was not before 1968 that the dot matrix printer started its career as a commercial product, produced by the Japanese company OKI, which named the device OKI Wiredot. But despite the rapid developments in the printing industry in the following years, the dot matrix printer is still alive.
Of course, its printed image is not as delicate as the ones that laser or ink jet printers produce today. This is due to the concept of the dot matrix teletypewriter which is based on a print head containing 24 needles. Depending on the structure of the content to be printed these needles shoot out of their holders onto the ribbon and thus produce the desired image. This looks a bit rougher than the printouts of modern printers.
The advantage of the anachronistic seeming device is the following: Only dot matrix printers actually use “pressure” and can thereby fill multi-ply paper with content to the very last sheet. Therefore, dot matrix printers are still in use in the medical, commercial and regulatory sectors. In 2013, OKI even received the title “Technologically Valuable Heritage” for the dot matrix printer