SCO, scourge of the LINUX world, has filed a trademark application for UNIX SYSTEMS LABORATORIES, which had been a registered mark belonging to, oddly enough, Unix System Laboratories. As far as I can tell, the registration went from USL to Novell to X/Open, which let the thing lapse in 2000.
The folks at Slashdot and GrokLaw are upset by this filing but it appears that SCO had Novell assign it a registration for UNIXWARE, and that registration isl valid. In fact, that appears to be the only valid registration that incorporates UNIX, covering software. And it’s more than 5 years old and has had its Sec 8/15 accepted, so it’s invulnerable to some (but not all) challenges.