I've always had a ploy I used to avoid this to a degree. When joining a company you have to fill out "prior inventions". I generally list a number of names and

I've always had a ploy I used to avoid this to a degree. When joining a company you have to fill out "prior inventions". I generally list a number of names and general vague descriptions. The catch is, none of them exist they are simply invented in my head. When building a side project I use one of the names from my prior inventions list.