Caterpillar on Monday announced record third quarter sales and profit, but said weaker-than-expected global economic conditions would dampen full-year and 2013 results. Lower demand has caused dealers to postpone new orders in an effort to reduce inventory levels, it said. The heavy-equipment manufacturer, a leading U.S. exporter, now estimates revenues of about $66 billion this year and profit between $9 and $9.25 per share, down from its earlier estimate of $68 billion to $...