The defense motion argues that trial Judge Steven O’Neill erred in declaring Cosby a sexually violent predator who should be imprisoned to protect the community.
They called the sentence more punitive than necessary, given the standard two- to three-year guideline range and the fact Cosby is 81 and blind.
They also say the trial evidence never proved the encounter took place in 2004, and not 2003, or that Cosby was arrested within the 12-year time limit.
Cosby has been in a state prison near Philadelphia since the Sept. 25 sentencing on three felony sex assault counts.
Montgomery County prosecutors say they will file a response.