Knowledge-based economy gives rise to new trademark opportunities
The neighborhood ice-cream truck playing the distinctive musical trio of Turkey in the Straw, Camptown Races and The Entertainer is a memorable sound of summer. And these are now registered trademarks for ice-cream-making machines.

But they are not the only sound of the season seeking trademark protection, says Michael Spink, an attorney and shareholder at intellectual property law firm Brinks Hofer Gilson & Lione in Ann...