David A. Burge Co., L.P.A. Shaker Heights Patent Attorney, Mechanical Invention Patent Searches, Patent & Trademark Law Firm, Trademark Registrations, Northeastern Ohio, David A. Burge Co., L.P.A. Shaker Heights Ohio Patent Attorney. Mechanical Invention Patent Searches are a major focus of our Work. We are a small, well-established patent & trademark law firm located in Northeastern Ohio, serving Ohio and the Midwest. David is the author of the popularbook, Patent and Trademark, Tactics and Practice. It's third edition is currently published and the fourth edition is underway.