interesting your finding. wonder which time did he live. but internet has not much about him.
no idea which age he was when happened this stated in a link:
received at the Munich exhibition industry in 1854 a good mention "for the exhibited good pianos". http://wiki.hammerfluegel.net/index.php/Emmerich_B%C3%A9tsy
when he was very young that time so possible him in Budapest later around 1900?! or a samenamed son. as the hungarian name possible they went back Hungary later.....?!
but normally maybe to find out about city- and country-archive Vienna at registry-dates which started what i know -> Ministerialverordnung vom 15. Februar 1857 RGBl. Nr. 33
Stadt- und Landesarchiv Wien - MA8:http://www.wien.gv.at/advuew/internet/AdvPrSrv.asp?Layout=st...
in any case gravesearch Vienna has not this name, so guess they went home:http://www.friedhoefewien.at/eportal/