I'm also a European founder who initially came out to Berkeley for school. Before my student visa expired I put together an E-2 application that ultimately got denied. It's a complex visa that requires a lot of documentation, so highly recommend you get an experienced immigration lawyer who can guide you through the process, understands the business side of things and can help you avoid any pitfalls. Some things to consider for the E-2 from my experience:
- You need to own >50% of the company at the time of application or if you have co-founders from the same country, collectively you need to own >50%.
- You do need to invest your own money in the company - there isn't a defined amount but your company needs to have a plausible path to financial sustainability, generating profits and ideally hiring US workers. Like you say, IP can count toward this investment. I invested my savings in the company, but they weren't convinced it was irrevocably committed because most of it hadn't been spent (!)
- If you're investing money, make sure you show where the money came from and how it was earned (in my case, some was gifted by family through inheritance and it got super messy especially as we hadn't been clear from the outset)
- The E-2 is time limited and doesn't have a path to residence - meaning it is either issued for a 2 or 5 year period and has to be renewed. At renewal you'll need to show that your company is still going strong, otherwise it could be denied. You'll need to find other options for a Green Card / Citizenship.
- You can apply in your home country or in the US as a change of status. Better to apply in your country as this gives you a physical visa that allows you to come and go. If you only have a change of status, if you leave you'll have to apply for the E-2 in your home country all over again.
- US Embassies in different countries have slightly different approaches around the E-2 or requirements in how the documents are filed. Take a close look at their website and ideally get a lawyer who is familiar with the embassy that you intend to apply through.
Get some good advice, most lawyers will give you a short initial consultation for free. Avvo.com was a life-saver. Peter Roberts who advises a lot of YC companies is also highly recommended.
Thankfully my wife ended up getting us green cards through her own employment... I think there's some truth to the other comment about not moving. Living costs are very high in the SF Bay Area, talent comes at a premium and it's increasingly difficult for smaller startups to recruit great people.