Hi all. My husband and I bought a house a few years ago and were told the windows had been replaced fairly recently. Unfortunately for us, we were not left with any information on the warranty and as first time home buyers, we didn't know any better. One of the many surprises we found in the house is something I am now realizing is common, a few of our windows are fogging up within the double panes. We do have some warranty information on one of the windows that includes the date the windows were installed, a PO number, and what I would assume is a serial number. The problem as you may have guessed by my post title is that there is no brand. I've tried googling for images to attempt to match the look of our warranty information but have come up unsuccessful. Does anybody out there have any suggestions?