Assignment or transfer of a trademark must occur in conjunction with the transfer of goodwill represented by that mark, or else the assignment is invalid. Furthermore, if assignment occurs without goodwill, the trademark is effectively abandoned Typically, it is the assignee's rights in the mark that are abandoned, but sometimes it is the assignor that abandons its rights. The result of such an abandonment on the assignee is that the assignee cannot benefit from the early first use date of the assignor, and must instead go by the assignee's date of first use in order to establish priority.