(nasdaq:wwww), a leading destination for websites and web services, announced that the u.s. patent and trademark office awarded the company its twenty-first patent. u.s. patent number is entitled "method and apparatus for providing name services" and was filed in july . about web.com web.com, inc....
polytetra-fluorethylene(ptfe) ptfe specific gravity: shore hardness (d) colour: white max temperature resistance: °c water absorption: % i ii non-friction material, resistant to most corrosive reagents, electrically non conductive. ptfe is particularly suitable for criogenic liquid and acid - handling apparatus...