[throwaway1177]

What about competitors ? If this is important enough for a patent filing, there may be competitors to your ex-firm interested in your skills and expertise. Have you considered that angle ?

[randomly123]

I can create a firm of my own to do the same work. But I feel I can funded better in the field of Lithium Ion batteries, so I think I should probably file IP of my old patents, and then sell them Or, I should sue my older firm for equity / money / IP and then put the winnings in my new firm.

[randomly123]

My skills at the art are not the best in the world. My B.S and M.S are in one field and this invention is in another field.

I can choose to file IP in the same field and seek funding. Or Just destroy the old firms IP. In India there is something called pre grant opposition.