물권법
Cuprill Oppenheimer was admitted to the practice of law in Puerto Rico in 1947 by the Puerto Rico Supreme Court (note: at the time, the bar examination and admission process was such that upon graduation of law school, an individual candidate had to undergo an extensive oral examination administered by each individual Puerto Rico Supreme Court Justice, and upon passing the bar exam, the U.S. Supreme Court would admit and confer upon the successful candidate a license to practice law in Puerto Rico). Cuprill Oppenheimer was also admitted to the United States Supreme Court Bar. As previously noted his law career was interrupted twice when he had to answer the call by the United States to serve his nation during World War II and the Korean War. He was rewarded for his sacrifices by having a successful law practice in good standing with the legal community for well over 50 years. Cuprill Oppenheimer is well known for his appellate work (Property law and Administrative law) and for having been instrumental and influential in setting landmark jurisprudence with the Puerto Rico Supreme Court in a multitude of his cases argued before the P.R. Supreme Court and the U.S. Supreme Court.