He was 35 years old when he was enrolled (5).
He was enrolled and mustered into service as a private on 9 September 1862, at Philadelphia, Pennsylvania (1, 5). He served as a private in company B (1).
He was reported absent without leave on 11 May 1863 (2). His reported status changed on 31 May 1863 (3). In the undated report for the 29th or 30th, company B has one fewer man absent without leave, and one additional man absent sick; Anten is probably that man (3).
He was transferred to the Veterans' Reserve Corps in July 1863 (1, 5).
1 Bates, Samuel Penniman. History of Pennsylvania volunteers, 1861-5. Harrisburg: B. Singerly, state printer, 1869-71. 5 volumes. 'Ninety-first regiment', volume 3, pages 186-233. (In the roster) (Joseph L Anten)
2 consolidated morning report, 91st PA, 11 May 1863 (Joseph L Anten)
3 consolidated morning report, 91st PA, undated, either 29 or 30 May 1863 (not named; inferred)
4 company B [first] descriptive roll, entry 12 (Joseph L Anten) [no information]
5 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 30 May 2004 (Joseph L Anten; rolls also have 'Auton')
[I did not find an entry for him in the index on <www.ancestry.com> to the pension index by name (searched September 2006)]
[I did not find an entry for him in the index on <www.ancestry.com> to the 1890 veterans' census (searched September 2006)]