A couple years ago I sold fullscreen.com for not much. 15 years ago I had applied for a trademark, but was refused, the USPTO said it was a generic computer term. They mailed me a photocopied computer dictionary with the term full-screen highlighted. I wondered about windows, but gave up there. I used the name briefly for a software product: screensaver & wallpaper 1-click installer.

Then a couple years a ago, a new fullscreen had somehow gotten the trademark. They said that I should sell the name because they had a trademark. Not being very clever, I sold it. I'd even been using the name again selling apps -- but my first use with the apps was a little after this new fullscreen got their trademark.

Maybe I screwed up -- but it felt to me like whoever had the money for lawyers was going to win a battle like that.