Irving M. Tullar, 61, who was an attorney specializing in the practice of patent, trademark and copyright law here since 1946, died Wednesday at the National Orthopaedic and Rehabilitation Hospital in Arlington after a stroke.

He had been affiliated with the Arlington firm of Jones, Tullar and Cooper since 1946 and had been a partner for the past 10 years.

Mr. Tullar was a member of the American, District of Columbia and Virginia bar associations, the American Patent Law Association and the United States Trademark Association.

He was born in Galesburg, Ill., and reared in Washington where he graduated from McKinley Technical High School in 1934. He earned a bachelor's degree at Albion College in Michigan, and was a 1946 graduate of George Washington University's law school.

He served with the Navy during World War II and attained the rank of commander.

Mr. Tullar was a member of the Kenwood Golf and Country Club and the National Republic Club of Capitol Hill.

He had resided in Kenwood for more than 25 years before moving to McLean in 1978.

Survivors include his wife, Katherine T., of McLean, and a brother, Edgar W., of Silver Spring.

The family suggests that expressions of sympathy be in the form of contributions to the National Orthopaedic and Rehabilitation Hospital's Rehabilitation Center.