Alexander Wyman, 69, a retired examiner and division chief in the U.S. Patent Office who later practiced patent law in Washington, died of cancer Thursday at Georgetown University Hospital.

Mr. Wyman was born in New York City and grew up there and in Roscoe, N.Y. He earned a degree in chemical engineering at Cooper Union in New York and later worked for the Post Office there.

He moved to the Washington area in 1938 and joined the Patent Office as an examiner. At that time of his retirement in 1966, he was a division chief in the chemical arts section, examining patents on laminated materials and similar developments. He contributed articles to Patent Office publications and also was an acting member of the Patent Office Board of Appeals.

In 1951, Mr. Wyman earned a law degree at American University. After leaving the Patent Office, he joined the firm of Denderoth, Lind & ponack, specialists in patent law. He retired a second time in 1972.

From 1976 until his resignation last year for reasons of health, Mr. Wyman, a resident of Rockville, was a volunteer in the office of Rep. Michael D. Barnes (D-Md.).

Survivors include his wife, Sydelle, of Rockville; a son, Paul, of Alexandria; two daughters, Emily Wyman of Washington, and Barbara Bernstein of Fort Collins, Colo.; a brother, Daniel, of Silver Spring, and three grand-daughters.

The family suggests that expressions of sympathy be in the form of contributions to the Washington Hospice Society, 1828 L St. NW, Washington, D.C.