Can an assignee of a part interest alone file a reissue application?

No, an assignee of a part interest alone cannot file a reissue application. According to MPEP 1410, a reissue application must be applied for by all of the inventors, unless the application is accompanied by a petition under 37 CFR 1.182 for waiver of the requirement. Alternatively, the assignee of the entire interest can file the reissue application. An assignee of only a part interest is not entitled to file a reissue application on his or her own.