H1B visa case status will change or not


I got my visa till Dec 2013, I have problem with my employer on Oct 2011. So I quit the company and came to home town. Is there a way to check my visa status is alive or not.
Its almost 1 year gap. If it is valid mean can I transfer my visa to another employer? 

If the visa got revoked by my employer (i.e.cancel) mean then, the status in the egov.uscis.gov/cris/Dashboard/CaseStatus.do will be change? 

Any idea please help