In case it's helpful to someone I had a case where I was attempting the same with an ajax-bound grid that had grouped columns and had to modify the loop in the onDataBound function in Dimiter's solution to something like:
for(varg = 0; g < gridData.length; g++) { for(vari1 = 0; i1 < gridData[g].items.length; i1++) { for(vari2 = 0; i2 < gridData[g].items[i1].items.length; i2++) { for(vari3 = 0; i3 < gridData[g].items[i1].items[i2].items.length; i3++) { varcurrentUid = gridData[g].items[i1].items[i2].items[i3].uid; if(gridData[g].items[i1].items[i2].items[i3].ProcessedDate != null) { varcurrentRow = grid.table.find("tr[data-uid='"+ currentUid + "']"); $(currentRow).find(".k-grid-Edit").hide(); } } } }}