Display screen or portion thereof with transitional graphical user interface

The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.

FIG. 1 is a front view of a black and white version of a first image of a first sequence of a display screen or portion thereof with transitional graphical user interface according to the claimed design;

FIG. 2 is a front view of a second image of the first sequence;

FIG. 3 is a front view of a third image of the first sequence;

FIG. 4 is a front view of a black and white version a first image of a second sequence according to the claimed design;

FIG. 5 is a front view of a second image of the second sequence;

FIG. 6 is a front view of a third image of the second sequence;

FIG. 7 is a front view of a color version of a first image of a third sequence according to the claimed design;

FIG. 8 is a front view of a second image of the third sequence;

FIG. 9 is a front view of a third image of the third sequence;

FIG. 10 is a front view of a color version of a first image of a fourth sequence according to the claimed design;

FIG. 11 is a front view of a second image of the fourth sequence; and,

FIG. 12 is a front view of a third image of the fourth sequence.

The longer-length dashed broken lines show an electronic device and form no part of the claimed design. The shorter-length dashed broken lines show the perimeter of a display screen and various elements within the graphical user interface, and form no part of the claimed design. The dot-dash broken line shows a portion of the graphical user interface, and forms no part of the claimed design.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1 - 3 in a first embodiment, FIGS. 4 - 6 in a second embodiment, FIGS. 7 - 9 in a third embodiment, and FIGS. 10 - 12 in a fourth embodiment, respectively. The process or period in which one image transitions to another forms no part of the claimed design.