The broadest versions of those clauses are invalid in some places, notably including California. But even California allows the employer to take ownership of ce

The broadest versions of those clauses are invalid in some places, notably including California. But even California allows the employer to take ownership of certain things done on employees' own time, and many other places do allow the broadest clauses. So yes, I agree with the advice to consult a lawyer and bring all relevant legalese for their review.