Frederick Marchionna, 94, a retired patent examiner, patent attorney and consultant who specialized in rubber and plastic chemistry, died May 10 at his Washington home. He had diabetes.

Born in Castel di Sangro in the Abruzzi region of Italy, Mr. Marchionna immigrated to this country in 1909 to further his education. In 1924, he earned a bachelor's degree in chemical engineering from Case Western Reserve University in Cleveland after attending school and working part-time.

He then moved to Washington and went to work for the U.S. Patent Office, now the Patent and Trademark Office, from which he retired in 1957. oMr. Marchionna also was a consultant in rubber and plastic chemistry to a number of U.S. and international rubber companies. He was the author of three reference works on latex and rubber derivatives.

He served in the Army during World War I, and during World War II was a government consultant on rubber production.

In 1926, he earned a master's degree in physical chemistry from George Washington University, and in 1933 earned a law degree from Southeastern University here.

In 1975, he was honored by the American Chemical Society on the occasion of his 50th anniversary as a member.

Mr. Marchionna was a member of the Sons of Italy.

Survivors include his wife, Evelina, of Washington; a daughter, Celeste M. Icampo of Kensington; a son Frederick H., of Cornwall, Conn., and four grandchildren.