Although I seriously doubt they're financially able nor legally able to protect their trademark since they've let it go this long. (think kleenex - you can't start protecting a trademark that has been commonly used for ages).
Bad example. Kleenex is still a trademark and no one else can market tissues as Kleenex. Cellophane and Aspirin, however, do fall into the category of trademarks that have passed into common use.
--Chris