Sprang's name never appeared on his Batman work during his career, due to stipulations in Bob Kane's contract which stated that Kane would have sole credit as Batman's creator, regardless of whether he worked on any particular story.
Sprang's name never appeared on his Batman work during his career. This was due to stipulations in Bob Kane's contract. Kane would have sole credit as Batman's creator. This was regardless of whether he worked on any particular story. This was what these stipulations in Bob Kane's contract stated.