B1 Visa in Old Passport and Expired L1B visa in existing Passport:

[gops75]

Hello Friends,
I renewed my passport in 2012. Before that, in the old passport, I got B1/B2 visa that is still valid. I used that visa to travel to USA before August 2012. In Aug 2012, I got L1B visa stamped in my current passport. Also I have old passport and new passport pinned and used to take them whenever I go abroad, which means valid B1/B2 visa in expired passport, and expired L1B in current passport.

Now I have to travel to USA for attending a conference. This is not at all connected to my profession. This is a competition. I wanted to know if I have to take a new B1 visa to travel or the old visa will be good enough to allow me in.

Please advise.

Thanks and Regards,
GV

[jnk]

You don't need to apply for new B1 visa. You can carry both passport during travel.

Please read 2nd visa FAQ under post visa issuance,

https://www.immihelp.com/usa-visa-faq/