Cyrill Demian's accordion patent application in Vienna

Background. Cyrill Demian was an Austrian inventor of Armenian-Romanian origin who worked as an organ and piano maker in Vienna with his sons Karl and Guido. Born in Gherla, Transylvania, he established his reputation in Vienna. His patent application for the accordion, which coined the name, was presented to authorities in May 1829, marking a significant development in musical instrument history.

Patent Application. On May 6, 1829, Cyrill Demian and his sons presented the accordion to the authorities for patent. The instrument was described as a small, portable box with metal reeds and bellows, designed to be easily carried by travelers. It functioned as an accompanying instrument, capable of being played with both hands simultaneously, differing from earlier chromatic hand harmonicas.

Instrument Features. The patent covered instruments with both bass and treble sections, but Demian preferred the bass-only version due to its cost and weight advantages. The accordion was characterized by automatically coupled chords on the bass side. This configuration allowed for accompaniment functionality, distinguishing it from other reed instruments of the time.