Can an account be sold and then reported under NEW company to restart the 7 year report period?

If you go late in 2000 and then the creditor charges off your account in 2001, then the creditor sells to another company in 2002 who reports at that time a new fee which is the original plus additional collection charges. In 2004 the 2nd company sells to a 3rd company who again adds more charges and reports it late in 2004. When does the 7 years expire on ALL of these? Will ALL of them be removed in 2007 when the initial debtor's record is removed or simply the original one while the other 2 stay?