David Joseph Williamowsky, 61, a retired examiner-in-chief of the board of appeals of the Patent Office who was active in Jewish and service groups, died June 7 at George Washington University Hospital following a heart attack.

Mr. Williamowsky, who lived in Silver Spring, joined the Patent Office in 1946. He was appointed examiner-in-chief of the appeals board in 1975 and held that post when he retired in 1979. Since then, he had practiced law in the firm of Sandler & Greenblum.

A native of Lithuania, Mr. Williamowsky came to this country in 1926 and grew up in North Carolina and Alexandria, where he graduated from George Washington High School. He earned a bachelor's degree at North Carolina State University and served in the Army in World War II. He later earned a law degree at National University, now part of the George Washington University.

He was a member of the Government Patent Law Association, a founding member of the Shaare Tefila Congregation, the Samuel Gompers Masonic Lodge, the Jewish War Veterans and B'nai B'rith.

Survivors include his wife, Meriam, of Silver Spring; three children, Martin, of Silver Spring, Diane Miller, of Burke, Va., and Larry, of Gaithersburg; a brother, Dr. Ben, of Silver Spring; four sisters, Sara Dick, Miriam Ginsburg and Pauline Weinstein, all of Silver Spring, and Frances Himelfarb, of Chevy Chase, and two grandchildren.