Earlier quoted context omitted.
I can give you the cynical truth on it: Large employers will generally own whatever you do in your spare time. They will not mention this, and generally not care, but if you make a ton of money or do something really popular, they will start a fight. Note: "The employee bears the burden of establishing his invention comes within Labor Code section 2870. (Lab. Code, § 2872.) " See also cubic corp v. marty, which disas…
What connection does Cubic v Marty have to this? From Justicia: > In mid-May 1977, Marty came up with an idea for an electronic warfare simulator (EWS), a device for training pilots in electronic warfare. He developed a block diagram in May 1977 and in June 1977 a manuscript describing his invention. He showed both the diagram and manuscript to Minton Kronkhite of Cubic, representing it might be a new product which C…
It's the leading case and, as i said, quoted to this day in pretty much every other case.
Please ignore the facts of this case, what matters here is the courts view on what it means to be related to the business, who bears the burden of proof, etc.
"This is nothing like the scenarios we are talking about where an employee invents something on their own time with no connection to their company or their work. "
Define "no connection". In the hundreds of times i've had employees claim this, i can count on one hand the nubmer of times they were right factually (IE they often don't know enough about a large company to know everything that is going on, etc), and can think of only one case i think a court might agree with them.
Again, feel free to find a case that supports the general view that stuff you do on your own time is yours, and employers are going to have to fight to get it.
Because Cubic says the opposite - the burden is on you to prove it is something that isn't owned by your employer.