Since the romantic age some composers have pushed the boundaries of both the classical format as well as the use of the instruments.
Georg Philipp Telemann wrote many such sonatas as did Johann Sebastian Bach.
Bach also wrote sonatas with harpsichord obbligato, which freed the keyboard instrument from playing only a bass line accompaniment and allowed in to enhance the part of the soloist.
[2] Mendelssohn, Schumann, Brahms, Schubert, Weber, Liszt, Richard Strauss, Franck, Fauré, Debussy, Ravel, Prokofiev and Shostakovich amongst other later composers added to the repertoire pushing the form to its limits, or writing rules of their own.
[3] Schnittke (with his polystylistic technique), and Henze are noted modern composers of the violin sonata who have all brought about radical reformation of the classical sonata form as well as new technical demands on the performers.