Milton O. Hirshfield, 70, a retired examiner in the U.S. Patent and Trademark Office, was among the 577 people who died Sunday in the Collision of two airliners in Santa Cruz de Tenerife, Canary Islands.

He had retired as supervisory primary examiner in 1971 after 42 years with the Patent and Trademark Office here.

Shortly after he left this area in 1973 to live in Long Beach, Calif., Mr. Hirshfield, a widower, married Matile Kaplan. She also was killed in the air crash. They were among the Pan American World Airways passengers booked for a Mediterranean cruise.

Born in Cleveland, Ohio, Mr. Hirshfield received a degree in electrical engineering from Case Western Reserve University in 1929. He then came here to work at the Patent and Trademark Office. He then earned a law degree from National College of Law.

He was a former president of the Patent and Trademark Office Society. Mr. Hirshfield also was a member of B'nai Israel Congregation here and sang in its choir. He participated in amateur Shakespearean theatrical productions in this area.

A former member of the Silver Spring Camera Club, he was a member of the board of directors of the Long Beach Camera Club. He had won a number of awards for his photography over the years.

Mr. Hirshfield's first wife, Tema, died in 1972.

He is survived by two sons, Dr. Jay Hirshfield of Hamden, Conn., and Edard Hirshfield, of San Jose, Calif.; two sisters, Ruth T. Horwitz, of Chevy Chase, and Evelyn J. Aronstam, of Lauderhill, Fla.; a brother, Dr. Stanley Hirshfield, of Gulf Breeze, Fla., and six grandchildren.