What are the differences in patent applicant rules for applications filed before and after September 16, 2012?

The rules regarding who can be a patent applicant changed significantly for applications filed on or after September 16, 2012. MPEP § 605 outlines these differences: For applications filed on or after September 16, 2012: “Effective September 16, 2012, the Office revised the rules of practice to permit a person to whom the inventor has…

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