NATIONAL TRADEMARK EXPO with CHILDREN’S WORKSHOPS The United States Patent and Trademark Office (USPTO) will host the 2014 National Trademark Expo from 10 a.m. to 5 p.m. Friday, Oct. 17, and 10 a.m. to 4 p.m. Saturday, Oct. 18, at the USPTO’s headquarters, 600 Dulany St., Alexandria. The free, family-friendly event is designed to educate the public about trademarks and their importance in the global marketplace. Numerous exhibitors, including governmental agencies, businesses and non-profits will showcase their trademarks. The Expo…