Trying to remove the fixed panel on my sliding door

I'm afraid I don't know who made your door. The stamp on the glass only tells us who made the glass, not the door itself. Additionally, your handle is a generic type used by many, many different companies.

Would it be possible to see a clearer picture of the top and bottom corners of the door on the wall-side? Your third photo is a little hard to make out. Can you also take a clear picture of the bottom edge where it touches the threshold?

There is normally some type of clip mounted to the back stile of the stationary panel that needs to be removed. Take a look at the vertical stile on the main frame of the door, sometimes the stationary screws are hidden inside the wool pile groove at the back of the door frame. That could be keeping the stationary door panel in place. 

In some cases there are clips at the front end of the stationary door. One at the top and one at the bottom in the track. Take another look around your stationary door to see if you can see any screws or brackets. There has to be something, otherwise the door would just fall out. It very well may just be a little hidden.