Dyrenforth, Robert St. George was born on October 17, 1844 in Chicago, Illinois, United States. Son of Julius and Caroline Dyrenforth.
Cadet at Breslau, Neisse and Berlin, Prussia, 1857-1861. Graduate Breslau, 1861. In the United States army, 1861-1866.
Mechanical Engineering Polytechnic School, Carlsruhe, Baden. Doctor of Philisophy, University of Heidelberg. Doctor of Medicine Columbian (now George Washington University, 1870, Bachelor of Laws, 1875 (Doctor of Laws).
Enlisted April, 1861, Schambeck dragoons, Illinois, cavalry, serving under McClellan and Rosecrans, in West Virginia. Later captain and major 13th, 12th and 17th Illinois Cavalry. Assistant inspector general and signal officer in department of the Missouri.
As acting engineer officer fortified mouth of Missouri River, in advance of Price’s raid, 1864. Finished service on plains in Indian campaign, 1865. Several times wounded.
Received several brevets. Was 2d assistant, 1st assistant and principal examiner, examiner-in-chief, assistant commissioner, United States Patent Office, 1871-1885. In patent practice at Washington, since 1885.
General and commander-in-chief Union Veterans’ Union (5th term). Commander Military Order of Merit. Home: Washington, Distric.