When you've got $10,000+ to spend on doing so, and have a reasonable expectation of that being a wise expenditure of resources. It often happens that patents a

When you've got $10,000+ to spend on doing so, and have a reasonable expectation of that being a wise expenditure of resources. It often happens that patents appear to have significant overlap, so "the same idea" is a problematic way to look at it. These aren't really evaluated thoroughly until and unless legal proceedings result.