Pattern welded late roman blades

[markusaurelius]

I can't seem to find any specific enough details. Were all the later Roman swords/spatha pattern welded? And were they pattern welded completely whole, or did they only have the center done, with a not pattern welded edging. I found this nice close up photo of a late roman spatha and it appears as though the whole blade is pattern welded, not just the center. Does anyone have any definitive info? I'm sure as with all Roman things there is not one clear answer.....

Pics would be nice