Hi,

My H1B was stamped in year 2012 by Employer A and its validity is till 2015. I have not yet traveled on this visa to US.
I was about to travel to US on the project on which I was working. But after a month of H1B stamping, the project was scrapped by the client due to some unknown reasons. Now Employer A do not have any project on which I can travel to US. My questions:
1. Can I change my employer in my Home Country and will the H1B still remains valid?
2. Can I apply directly to the US employer and use the same H1B ?
2. If I change my employer, do they have to file a fresh petition and do I have to get fresh stamping?
3. Is there any possibility Employer A can revoke or cancel the H1B stamping they have done?
4. Is there any official link which describes the rules of H1B?

Will the H1B will be of "no use" if I change my employer A in my home country, without traveling to US?
Please let me know the answers and expert advice.