You could try Tabs (Therapeutic Antibody Database), a commercial database; a 30 day free trial is available:

http://tabs.craic.com/users/sign_in

For therapeutic antibodies, I would also suggest review articles, but if you want a good database on antibody sequences, try this one:

http://www.imgt.org/

Thanks for giving important links.

link below has s list of few databases and and tools for Antibody analysis ....

http://www.antibodyresource.com/antibody-database.html

Also see

http://www.bionity.com/en/antibodies/all.html

You could try Tabs (Therapeutic Antibody Database), a commercial database; a 30 day free trial is available:

http://tabs.craic.com/users/sign_in

On page

https://www.science.co.il/biomedical/databases/Antibody-databases.php

there is a list of antibody databases.

Thanks

You can use another antibody database and tools at http://www.abysis.org/. 

You can search for specific antibodies in an antibody database from Biocompare at http://www.biocompare.com/Antibodies

https://www.benchsci.com analyzes publications and extract published figures for commercially available antibodies.

DrugBank

https://www.drugbank.ca

http://www.benchsci.com is the very much new and best in my opinion.