Patent Publication Number: US-D763289-S

Title: Display screen or portion thereof with transitional graphical user interface

Description:
FIG. 1  is the first image in a sequence for a display screen or portion thereof with transitional graphical user interface showing our new design; 
         FIG. 2  is the second image thereof; 
         FIG. 3  is the image of  FIG. 1  with additional unclaimed environmental subject matter shown in broken lines; and, 
         FIG. 4  is the image of  FIG. 2  with additional unclaimed environmental subject matter shown in broken lines. 
       The broken lines showing of the display screen in the figures and the device in  FIG. 3  and  FIG. 4  are for the purpose of illustrating environmental structure and form no part of the claimed design. 
       The appearance of the transitional image sequentially transitions between the images shown in  FIGS. 1-2  and between the images in  FIGS. 3-4 . The process or period in which one image transitions to another forms no part of the claimed design.