What is the difference between an assignment and an agreement to assign in the context of MPEP 409.03(f)?

MPEP 409.03(f) distinguishes between an assignment and an agreement to assign in the context of proving proprietary interest for pre-AIA 37 CFR 1.47(b) applications. The key differences are: Assignment: A completed transfer of rights in the invention. Agreement to Assign: A promise to transfer rights in the future, often conditional. For an assignment, MPEP 409.03(f)…

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