Silvio C.J. Patti, an engineer who served on the U.S. Consumer Product Safety Commission in the late 1970s, died of cancer Wednesday at Fallston General Hospital. He was 70 and lived in Towson.

A mass of Christian burial for Mr. Patti was being offered today at St. Margaret's Church, 141 Hickory Ave. in Bel Air.

After retiring in 1982, he owned the Bel Air Card and Gift Shop, and was a part-time teacher of electronics at Catonsville Community College.

He is survived by his wife of 43 years, Elsie R. McDougal Patti; four sons, Joseph Patti and Thomas Patti of Bel Air, John Patti of Fort Lauderdale, Fla., and Robert Patti of Freeland; a daughter, Barbara Patti of Bel Air; and one granddaughter.

The family suggests that contributions be made to the Grant-A-Wish Foundation, P.O. Box 21211, Baltimore 21228.