Robert J. Patch, a patent lawyer and partner in the Alexandria law firm of Young & Thompson, died Sept. 5 at Sibley Memorial Hospital in Washington. He was 86. He lived in Alexandria.

The cause was cancer, said his son, Andrew Patch.

Mr. Patch joined Young & Thompson in 1964 and had continued working there until this summer. Earlier in his career, he had been a patent examiner and patent counsel to the law firm of Shanley and O’Neill.

Robert John Patch was born in Washington. He graduated from Wilson High School in 1944, served in the Army during World War II and graduated from the University of Michigan in 1948. He received a law degree from George Washington University in 1952.

His wife, Susanne Steinem Patch, whom he married in 1954, died in 2007. Survivors include six children, Susan L. Patch of Kensington, Robert W. Patch of Cabin John, Thomas F. Patch of Charlotte, Jeffrey S. Patch of Germantown, Andrew J. Patch of Ellicott City and Theodore N. Patch of Chevy Chase; and 12 grandchildren.

— Bart Barnes