In 1841, Sax relocated permanently to Paris and began work on a new set of instruments which were exhibited there in 1844. They were valved bugles, and although he had not invented the instrument itself, his examples were so much more successful than those of his rivals that they became known as saxhorns. They range in approximately seven different sizes, and paved the path to the creation of the flugelhorn. Today, they are widely used in concert bands and sometimes in orchestras. The saxhorn also laid the groundwork for the modern euphonium. Sax also developed the saxtromba family, valved brass instruments with narrower bore than the saxhorns, in 1845, though they survived only briefly.
The saxophone was developed circa 1840 by Adolphe Sax, a Belgian-born instrument-maker, flautist, and clarinetist working in Paris. Although he had constructed saxophones in several sizes by the early 1840s, he did not receive a 15-year patent for the instrument until June 28, 1846. It was first officially revealed to the public in the presentation of the bass saxophone in C at an exhibition in Brussels in 1841. Sax also gave private showings to Parisian musicians in the early 1840s. He drew up plans for 14 different types of saxophones, but they were not all realized
so developed 1840, patented June 28, 1846