Charles Jacob Eiwen, 69, an engineer by training who since 1967 had been the owner and president of Daubers Inc., a Washington restaurant equipment service company, died of cancer and Parkinson's disease July 26 at Northern Virginia Doctors Hospital. He lived in Arlington.

Mr. Eiwen, who had lived in this area since 1939, was a native of New York City. He was a graduate of the Cooper Union in New York and earned a master's degree in aeronautical engineering at Catholic University. He was a Navy civilian employe during World War II and served in active duty during the Korean War. From 1957 to 1967, he was an engineer with the American Machine and Foundry Co. here. Before that, he was a civilian engineer with the Defense Department's standardization division.

Mr. Eiwen was a fellow of the Standards Engineers Society and had edited its Standards Engineering magazine. He was a past president of the Broyhill Forest Civic Association and was a member of the Walker Chapel United Methodist Church in Arlington, the Parkinson's Society of Washington and the Harmony Masonic Lodge.

Survivors include his wife, Harriet, of Arlington; a son, Charles Herbert Eiwen of Washington and Raleigh, N.C.; two daughters, Evelyn Sinclair of Washington and Emily Eiwen of Charlottesville; a sister, Helen Smith of Brockport, N.Y., and four grandchildren.