When is the nonprovisional deadline?
The 1-year anniversary of a US provisional patent application or a foreign priority application may occasionally fall on a non-business day. In such circumstances, the deadline for filing a US nonprovisional application claiming priority to the earlier priority application extends to the next business day.
What if the nonprovisional due date falls on a weekend?
When the last day of the 12-month period for claiming the benefit of a US provisional application falls on a Saturday, Sunday or federal holiday, MPEP 211.01(a) states that the nonprovisional application may be filed on the next succeeding business day.
If the last day of the 12-month period for filing a US non-provisional application claiming priority to a foreign application falls on a Saturday, Sunday or federal holiday, the non-provisional application may be filed on the next succeeding secular or business day according to MPEP 213.03.
PCT Rule 80.5 has similar provisions when it comes to the last day of any period during which any document or fee in an international application must reach a national IP Office or intergovernmental organization.