With over 25 years of experience in the practice of patent, trademark, copyright, and allied fields of law, John R. Crossan established his solo practice 5 years ago to better and more cost-effectively serve his clients in his specialty fields of law, including litigation in the federal courts. John prepares patent applications and prosecutes them to issuance, then helps maintain and enforce them; he files, prosecutes, and maintains federal and state trademark registrations and enforces them against infringers. He also defends actions and charges against clients’ alleged use of patented inventions and trademarks and copyrights. He licenses patent, trademark, and copyright rights and conducts and advises on litigation. John is admitted to the Illinois and US Supreme Courts, several U.S. Circuit Courts of appeal, and many federal district courts, including the Trial Bar of the Northern District of Illinois court. His technical training is in mechanical and systems engineering, and he has tried and won cases in mechanical, light biomedical, and light electrical arts, including in jury trials and appeals.