It depends on the state; in 8 states there are restrictions, most notably California. Such contracts aren't enforceable in CA: http://www.intellectualpropertyl

It depends on the state; in 8 states there are restrictions, most notably California. Such contracts aren't enforceable in CA: http://www.intellectualpropertylawfirms.com/resources/intellectual-property/patents/is-your-pre-inve http://www.intellectualpropertylawfirms.com/resources/intell... But of course, if you use any company resources (including computers)... then they can be.