Something similar did come up in the past...
here it is.
From the standpoint of a team like Woburn, which benefits from a bank and the school board as its major sponsors, it is absolutely inconceivable that the sponsors own anything team-related. It's simply a matter of donations paying for the team's expenses.
With the NiagaraFIRST teams, one might argue that the partnership owns the robots, but it still doesn't make sense to say that the sponsors own them. (I'm speculating; one of the senior adminstrative people from NiagaraFIRST could probably answer this definitively, if there is an official position on the matter: try Karthik, rourke or Derek Bessette.)