This type of policy is very frequently known as the Assignment Of Inventions or Invention Assignments. Sadly - they are very enforceable depending on the state you're in. For example, non-competes are still in force across the US, but in some places if they go to court they fall over.
IP clauses like this are slightly more enforceable - all the employer has to do is prove you were employed at the employer when you started a company/made some code/wrote a book. See also: http://theemplawyerologist.com/2013/01/17/works-for-hire-and...
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This type of policy is very frequently known as the Assignment Of Inventions or Invention Assignments. Sadly - they are very enforceable depending on the state you're in. For example, non-competes are still in force across the US, but in some places if they go to court they fall over.
IP clauses like this are slightly more enforceable - all the employer has to do is prove you were employed at the employer when you started a company/made some code/wrote a book. See also: http://theemplawyerologist.com/2013/01/17/works-for-hire-and...