Neil Francis Stull Sr., 80, a retired Washington lawyer who had specialized in U.S. oil, gas and mining laws, died Monday at his home in Arlington following a heart attack.

He retired from private practice in 1967. He had established the practice in 1944 after ending almost 20 years of government service.

Mr. Stull was born in Germantown, Ohio. He was a graduate of Ohio State University and took further studies at Syracuse University and the University of Chicago.

He came to Washington as a mineral examiner with the Interior Department in 1903 and attended George Washington University at night where he earned a law degree four years later.

Mr. Stull was an associate geologist with the U.S. Geological Survey of the Interior Department from 1927 to 1930. He then left government service to enter private business, but returned to the Interior Department in 1936 as a senior attorney and associate solicitor. He remained there until opening his own law offices.

Mr. Stull was an Army veteran of World War I. He belonged to the University Club and the Fishing Bay Yacht Club on Chesapeake Bay in Virginia.

He is survived by his wife, Florence C., of the home, and a son, Neil F. Jr., of McLean.