Will google registered or trademarked 'Pixel' ?

Did Samsung trademark Galaxy? The word can be trademarked for product naming, but if used to describe a product such as how many pixels are on a screen the trademark wouldn't come into play.

If Google was going to trademark it, it would be done by now, remember that we had the Pixel C and the Chromebook Pixel last year.
 
Nope, the Pixel device is release on 2013, if they would done it they had done it sooner. So conclusion, no.