If I have switched employers based on approved I140 then can I get my visa extended in future based on this approved I140 from my old employer? Please guide.
As long as your prior employer did not revoke the I-140 petition and your priority date is not current, yes, you can use that approval as a basis to have an employer extend your H-1B status for 3 years.
I agree with my colleague, the old I-140 must still be valid.
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If you are on the verge of the 6 year limit of your H-1B , your current employer can extend the H-1B on the basis of an un-revoked and approved FORM I-140 for which the employment based visa remains unavailable.
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