Since this work was first published after 1922 with the prescribed copyright notice, it is unlikely that this work is public domain in the USA. However, it is in the public domain in Canada (where IMSLP is hosted), the EU, and in those countries where the copyright term is life+70 years or less.
|Composition Year||1925 July 29|
|Genre Categories||; ;; ; ;|
|Work Title||String Quartet No.2|
|Year/Date of CompositionY/D of Comp.||1925 July 29|
|First Performance.||1925 November 12, Berlin|
|Dedication||...à mes amis, le Quatuor Roth à Paris: Roth, Antal, Molnar et van Doorn|
|Composer Time PeriodComp. Period||Early 20th century|
|Piece Style||Early 20th century|
|Instrumentation||String quartet (2 violins, Viola, Cello)|
The year 1925 is given in the article on Schulhoff in the New Grove Dictionary of Music and Musicians; it is not, however, specified if this is the year in which composition was completed, the year in which the premiere took place, the year of the first publication, et cetera.
Autograph @ ONB has date July 29 1925. That answers the question more or less (given that autograph scores don't always give exact dates of composition beginning or end- sometimes being dated well after completion- but will accept this answer :) ) - ES