What does ‘sufficient proprietary interest’ mean in the context of patent applicants?

The term ‘sufficient proprietary interest’ is introduced in the MPEP ยง 605 for patent applications filed on or after September 16, 2012. The MPEP states: “Effective September 16, 2012, the Office revised the rules of practice to permit […] a person who otherwise shows sufficient proprietary interest in the matter to file and prosecute an…

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