Applied Materials Returns to Profit  SAN FRANCISCO (Reuters) - Applied Materials Inc.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=AMAT.O target=/stocks/quickinfo/fullquote"&gt;AMAT.O&lt;/A&gt;,  the largest maker of chip-making tools, on Tuesday said healthy  spending on new semiconductor factories more than doubled  revenue and returned it to a quarterly profit.