Mary Patricia (Pat) Bradley, 39, a writer and researcher who was a member of the Catholic Council of Bishops' national committee for the handicapped, died of a pulmonary infection Aug. 20 at Fairfax Hospital. She lived in Washington and had been an area resident for the past 13 years.

Miss Bradley was born in Montgomery, Ala. A spinal disorder had confined her to a wheelchair throughout her life. She earned bachelor's and master's degrees in theology at St. Mary's College in South Bend, Ind.

She was an abstractor with the Congressional Information Service in Bethesda from 1974 to 1979. She had worked for the Council of Bishops for the past three years.

In addition, Miss Bradley had been a consultant to a congressional committee that held hearings on the problems of the handicapped. She had contributed articles to The Post's travel section concerning the problems handicapped persons have in different locales. She also reviewed books on the handicapped.

She was a charter member of Independent Living for the Handicapped. Miss Bradley was a member of Annunciation Catholic Church in Washington.

Survivors include her parents, Francis X. and Betty Bradley of McLean; four brothers, Joseph, of South Bend, Christopher, of Eureka Springs, Ark., and Michael and Francis, both of McLean, and a sister, Catherine (Kelly), also of McLean.