UPDATE 2-Intel's US$7bn four-parter gets US$20bn in demand

(Rewrites throughout, adds more details) By Paul Kilby and Natalie Harrison NEW YORK, July 22 (IFR) - Intel is on track to price a US$7bn bond on Wednesday to help finance its acquisition of chipmaker Altera after attracting more than US$20bn in investor demand. The deal, split across four tranches ranging in maturities from five to 30 years, had been long-expected by market participants. Initially marketed in June to European investors, the company held off announcing the deal un