Remove these screws and the handle should simply fall off.
Patio door handle broken.
Prime line c 1225 sliding patio door handle set replace old or damaged door handles quickly and easily white diecast mortise style non keyed fits 3 15 16 hole spacing.
The number on the inside piece is l 120.
You should find a few screws around the edge of the handle which need to be unscrewed or you may have a screw on the edge of the door frame.
My patio door is about 27 years old.
It has an acorn dorwal handle set.
You also might want to add or replace a keylock on the outside so you can open your patio door with a door key.
In addition to patio door handles handles there are other bits and pieces that often need replacing on patio doors.
The fix clips that hold the panels in place often get broken or get lost.