Assignment

a transfer of ownership of a patent application or patent from one entity to another. Record all assignments with the USPTO Assignment Services Division to maintain clear title to pending patent applications and patents.

-- read more about Patent Assignments

Context: Patent 

a transfer of ownership of a trademark application or trademark registration from one entity to another. The USPTO recommends recording assignments with the USPTO Assignment Services Division to maintain clear title to pending trademark applications and registrations. For information on how to record an assignment, see Recordation Form Cover Sheet.

-- see Assign a Trademark Application or Registration
-- see Search Trademark Assignments online

Context: Trademark 

Or Reassignment. The assignee (applicant) transfers ownership of the patent rights to another party.