AFAIK you cannot. This of course will depend on which terminal app you are using, but I think the point of setting the title is to identify different sessions easily, and is not meant to be preserved after closing the term.
If you want to add your title to always appear on all xterms, I think you will find it is source-code hacking time.
Another option is to use your PS1 variable to set xterm titlebar text. See the Bash Prompt HOWTO: