Thank you. Someone else also found this. Patterson also had another private act of Congress in 1890, to recognize his service for pension purposes. There seems to have been something irregular about his service and commission, since it doesn't show up on the company rolls. His unit definitely was WEST Virginia, which of course didn't exist in 1862; his later pension records list his unit as 3rd WV Cav.
My interest in Capt. Patterson comes from a reference in Briscoe Goodhart's History of the Loudoun (Virginia) Rangers, which states:
"The first effort put forth to recruit a battalion took tangible shape in the spring of 1863, while Company A was camped at Brunswick [Md]. Capt. Patterson, of Maryland , a former drillmaster of Company A (related to the Emperor Napoleon I. of France by marriage), was commissioned captain; Mr. Lovett, of Jefferson County, W. Va., was 1st lieutenant; William Bull was to be first sergeant. Recruiting offices were opened at Martinsburg, W. Va. There was issued to the company arms and uniforms for 50 men. Capt. Patterson was offered a better position in the Quartermaster Department. Lieut. Lovett became involved in some stock contracts, and the recruits, about 12 men, disbanded. The only one re-enlisted in Company A was William Bull. He came to Company A wearing first sergeant stripes. Although a private in Company A he was generally known as Sergt. Bull, or Patterson's Bull."