John E. Medaris, 62, an inventor of electronic-teaching systems and a consultant in their use, died of cancer Tuesday at his home in Sumner, Md.

Mr. Medaris founded several companies that provided electronic teaching systems. One of them, Electronic Teaching Laboratories, Inc., produced the widely used MONITOR language-learning device. The company once was engaged to teach English to Pope John XXIII.

Another company be founded was Universal Wood Products, Inc., the purpose of which was to make schoolroom furniture that could accommodate electronic-teaching systems.

Much of his work concerned the teaching of languages, and much of it was performed under contract to various government agencies.

Other companies Mr. Medaris started were Infra Code, Inc., which used electronic systems to teach persons with hearing and speech deficiencies, and Acumemion, Inc., which provided teaching aids for persons with general learning disabilities.

Many of Mr. Medaris's companies were dissolved through mergers. But the basic purpose of most of them was to provide intensive education for large numbers of students here and in foreign countries.

Mr. Medaris was born in Kansas City, Mo. He attended the University of Toledo and served in the Army during World War II. He was assigned to the European theater of operations and was a major when he was released from active service in 1946. He moved to this area after the war and founded his first company, Educational Laboratories, Inc.

Survivors include his wife, Harriet, of the home in Sumner, and two sons, Richard Perry, of the home, and John Dwight, of Lorton.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society.