Charles Holland Duell, twenty-fifth Commissioner of Patents, was the illustrious son of Robert Holland Duell, the fifteenth Commissioner of Patents.

Charles was born in Cortland, New York, April 13, 1850. Being graduated in 1872 from the Law Department of Hamilton College, he was soon thereafter admitted to the bar, and began the practice of law in New York City. Here he continued until 1880, with the exception of a short term as examiner in the Patent Office in 1875-1876. In 1880 he removed to Syracuse and continued the practice of law there, making a specialty of patent law, until called to Washington in 1898 as Commissioner of Patents. He returned to New York in 1901 to resume private practice until 1904, when he again returned to Washington to accept an appointment at the hands of President Roosevelt as Associate Justice of the U. S. Court of Appeals of the District of Columbia. He continued on the bench until 1906, returning again to New York as senior member of the firm of Duell, Warfield and Duell. His interest with this firm continued until his death on January 29, 1920.

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