Urgent - H1B related Query

Hello there,

Need suggestions regarding H1B visa.

Currently i am working in one company in India who has already stamped my Visa and my visa is valid upto Feb,2017 . Now if I change the company then previous employer will withdraw the petition and if new employer cannot transfer my Visa at that time, will my visa still be valid upto Feb 2017 like if suppose new employer wishes to file Visa transfer later like after 6 months or so…

Please suggest.