Frame for patient interface

1. 1The ornamental design for a frame for patient interface, as shown and described.

FIG. 1 is a rear perspective view of a frame of a patient interface;
FIG. 2 is a left side elevational view of the frame of FIG. 1;
FIG. 3 is a right side elevational view of the frame of FIG. 1;
FIG. 4 is a front elevational view of the frame of FIG. 1;
FIG. 5 is a rear elevational view of the frame of FIG. 1;
FIG. 6 is a top elevation view of the frame of FIG. 1; and,
FIG. 7 is a bottom elevational view of the frame of FIG. 1.
The broken lines in the drawings illustrate portions of the patient interface that form no part of the claimed design.