Delaying of national phase until expiry of 30 months 
Most contracting states apply Article 22 PCT as amended with effect from 1 April 2002. For these states, the 30/31-month time limit for entry into the national/regional phase applies regardless of whether the applicant has submitted the demand for international preliminary examination within 19 months from the (earliest) priority date.
The EPO too applies Article 22 PCT as amended with effect from 1 April 2002. Therefore, the time limit for entry into the European phase is always 31 months from the priority date (see points 5.1.010 ff).
However, in respect of a small number of designated Offices, old Article 22(1) PCT still applies. The list of the contracting states for which it is still applicable is published on the WIPO website (see point 1.3.005). According to the latest information from WIPO (status on 15 October 2021), the 20/21-month time limit applies to the following states: Luxembourg (LU) and United Republic of Tanzania (TZ). However, in respect of the regional designation of each of these states, the time limit under amended Article 22 PCT applies.[ 53 ]
PCT Newsletter 2/2005, 6 
Therefore, if an applicant wants to enter the national phase for these states, the demand must be received by the competent IPEA within 19 months from the (earliest) priority date to secure the right to entry into the national phase being delayed until expiry of 30/31 months from the priority date.
Moreover, for these states, the applicant must respect the 19-month time limit even where the ISR and the WO‑ISA are not yet available. In other words, a delay in the international search does not have as a consequence that the 19-month time limit is changed, since this time limit is exclusively calculated on the basis of the (earliest) priority date. 
For states applying the old Article 22(1) PCT, a demand filed with the EPO after expiry of 19 months from the priority date but prior to
three months from the date of transmittal to the applicant of the ISR and the written opinion (WO‑ISA) by the ISA or 
22 months from the (earliest) priority date 
is valid, but does not have the effect of postponing commencement of the national phase to 30/31 months for the states in question (see point 4.1.036).

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