[Raj123123]

The more thought and due diligence you put in, the lower the probability you will get screwed. However, how much effort, time, and $money into finding, hiring, talking to lawyer(s) do you want to put into this?

If you are at all worried about whether they are negotiating in good faith, then before you go any further, file one or more patents asap. This provides you with at least 2 things:

1) increases what you have to put on the table

2) if talks dissolve and you find they were in it to get as much info from you as possible (e.g. to use in their product), you have some legal options. Whether you need this recourse AND whether its even feasible, is left for a later time.

Business is war, expect no less. And in this case, the more they give you (cash or equity), the more they lose.