The ornamental design for a sleeveanchor for a sandwich panel, substantially as shown.
FIG. 1 is a top perspective view of a sleeve anchor for a sandwich panel,
embodying our design;
FIG. 2 is a top view of the panel; and
FIG. 3 is a side elevational view of the panel.
The characteristic feature of our design resides in the continuous pattern
of round and oval holes which are consistently intermixed along both top
and bottom end portions of the sleeve anchor.