Actually it is still not right, you can't lose a registered trademark simply because it became a generic word. Examples: 'to google' is now a generic verb / recognized verb, but Google still is a trademark. What you think of are trademarks based on generic words in the first place. like apple. Try to register Apple as a new trademark for a new computer line, bad luck (see
http://www.apple.com/legal/trademark/appletmlist.html) but it would be perfectly possible to register it as a trademark for a new line of furniture as long as isn't already registered as a trademark by another furniture company. Trademarks can't be lost simply by entering our language as a generic term, sorry. SY