How do I delete an app from the list of my purchased apps in the App Store?

Over time, I’ve accumulated many apps that I really didn’t like and I’ve deleted them from my iPad. However, when I go to my “purchased apps” list in the App Store, they are still there, ready to be re-downloaded (re-installed) again if I happen to touch the “Install” button.
But they’re just cluttering up the list, and I would like to permanently delete them from the list. Is there any way to do this?