About Us LexField Law Offices is a Beijing-based law firm focused on intellectual property, with a clientele representing a broad array of industries. Under our previous name, Jan Liu & Associates, we have earned respect around the world as a boutique IP firm specializing in trademarks, copyright issues, anti-unfair competition matters. With the July 2009 merger of our IP litigation team and a seasoned patent team, we have taken on a new name to reflect that we now provide a full spectrum of IP legal services, including patent work and IP litigation.