The attorney for 25-year-old Joshua Stafford of Cleveland filed the appeal notice on Wednesday with the 6th U.S. Circuit Court of Appeals in Cincinnati.
The filing didn't specify a basis for the appeal, and there was no immediate comment from Stafford's attorney in response to a message left on Thursday.
Stafford was sentenced Monday in Akron.
His co-defendants earlier pleaded guilty and received sentences of six to 11 1/2 years. Stafford was convicted in June at a trial where he served as his own attorney.
The plotters planted a dud provided by an FBI informant and no one was hurt.
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