I thought that a trademark was valid for a product only as long as the product is offered for sale. That is, if you're not selling it, there's nothing to protect. And then there's the matter of the question "Is anyone likely to confuse the two products or does the use of the trademark damage the original holder?" There's no way I'd confuse Wondra flour with Wondra hand lotion, for example.
What I find unconscionable, however, is the re-use of a trademark by its owner for something else entirely. It used to be that Pyrex(tm) signified an item made with a special type of borosilicate glass, known for its toughness. Apparently, the holder of the trademark has decided that ordinary soda-lime glass can also be called Pyrex when it applies to cookware. The result is that the long-advertised claim of "from freezer to stovetop" no longer applies. Try it with the bakeware being sold today as Pyrex and your bakeware can to explosively self-destruct. (Hint: if it's Pyrex cookware you want, go to a thrift store and purchase the stuff that doesn't have a green tint to it.)