Reuse H1B visa for the unused duration

I have a previously approved H1 petition. This was stamped in 2002 and should be valid for 6 years. However, I returned to India by mid 2004. Can I use the same petition number to return to the US on H1B visa. since i have used only2 years out of the eligible 6 years, I think I have another 4 years of time left on my earlier H1. Please clarify if this is valid and if I can come to the US on B1 and get it converted to H1B through my employer?

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See my response to your question on the other post here - http://redbus2us.com/qa/16936/b1-to-conversion-when-the-h1b-petition-has-pending-duration