Brunette Girl With The Sax

Having constructed saxophones in several sizes in the early 1840s, Sax applied for, and received, a 15-year patent for the instrument on June 28, 1846. The patent encompassed 14 versions of the fundamental design, split into two categories of seven instruments each and ranging from sopranino to contrabass. Although the instruments transposed at either F or C have been considered "orchestral", there is no evidence that Sax intended this. As only 3% of Sax's surviving production were pitched in F and C, and as contemporary composers used the E♭ alto and B♭ bass saxophone freely in orchestral music, it is almost certain that Sax experimented to find the most suitable keys for these instruments, settling upon instruments alternating between E♭ and B♭ rather than those pitched in F and C, for reasons of tone and economy (the saxophones were the most expensive wind musical instruments of their day). The C soprano saxophone was the only instrument to sound at concert pitch. All the instruments were given an initial written range from the B below the treble staff to the F three ledger lines above it, giving each saxophone a range of two and a half octaves.
Sax's patent expired in 1866; thereafter numerous saxophonists and instrument manufacturers implemented their own improvements to the design and keywork. The first substantial modification was by a French manufacturer who extended the bell slightly and added an extra key to extend the range downwards by one semitone to B♭. It is suspected that Sax himself may have attempted this modification. This extension was adopted into almost all modern designs.