The AIA rules published August 14, 2012 gave a patent applicant a free pass on handing in the signed inventor declaration late, indeed extremely late. The 2012 rules permitted the applicant to postpone handing in the declaration until as late as the time of allowance.
But not for CPAs (continued prosecution applications) from design patent applications. Due to an oversight in the 2012 AIA rulemaking, this free pass was not extended to CPAs in that rulemaking. On March 5, 2014 the USPTO published a rule change correcting the oversight and extending the free pass to CPAs.
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