You have already invested 1.5 years into it and it seems like you're making a cool product. Just continue and focus on creating a great product and deal with th

You have already invested 1.5 years into it and it seems like you're making a cool product. Just continue and focus on creating a great product and deal with the other things later. Chances are no one will bother to contact you unless you become one of the big companies. By then, you will have enough resources to handle it. It is a shame that software patent is hindering innovation instead of promoting it.