I'm looking to leave my current employer to bootstrap a start up and feel the urgency to buy the domain name immediately in readiness for the intense development and marketing that would follow. I've signed one of these assignment agreements as part of the employment contract a few years back but now want to press ahead with my own dream of a new start up. Could the purchase of the official domain now signal that I have started the project whilst employed by my current employer?
I was wondering if anyone had a similar situation that could offer some insight, other than the standard advice of speak to a lawyer?
From a risk calculus perspective, it only matters in the case you actually produce something of value but then becomes a landmine buried deep near the heart of the company, and the risk of that landmine can blow up later things you'd like to do like e.g. accept investment or sell the company. Your competent legal advisers will generally tell you "Do not do things which cloud IP ownership, and in fact, spend material amounts of time and money to do things which uncloud IP ownership such as e.g. getting IP assignments from your employees."
The biggest flag I'd raise, as someone who also gets domain fever occasionally, is that buying a domain name is a very tiny amount of the effort involved in a new project.
Maybe to avoid any frivolous lawsuits, register domain name using gift card under fake name. And once you are ready, buy it from that fake account. Again if you are really worried, talk to a lawyer.