States with applicable statutes (that I know of):

    * California  Cal. Lab. Code 2870-72 - http://www.leginfo.ca.gov/cgi-bin/displaycode?section=lab&group=02001-03000&file=2870-2872
    * Delaware    Del. Code Ann. tit. 19  805 - http://delcode.delaware.gov/title19/c008/index.shtml
    * Illinois    765 Ill. Comp. Stat 1060/2 - http://www.ilga.gov/legislation/ilcs/ilcs3.asp?ActID=2238&ChapAct=765%26nbsp%3BILCS%26nbsp%3B1060%2F&ChapterID=62&ChapterName=PROPERTY&ActName=Employee+Patent+Act.
    * Kansas      Kan. Stat. Ann. 44-1306 - http://www.kslegislature.org/legsrv-statutes/getStatuteFile.do?number=/44-130.html
    * Minnesota   Minn. Stat.  181.78 - https://www.revisor.leg.state.mn.us/bin/getpub.php?pubtype=STAT_CHAP_SEC&year=2006&section=181.78
    * NorthCarolina       N.C. Gen. Stat.  66-57.1-.2 - http://www.ncga.state.nc.us/EnactedLegislation/Statutes/HTML/ByArticle/Chapter_66/Article_10A.html
    * Washington  Wash. Rev. Code Ann.  49.44.140, .150 - http://apps.leg.wa.gov/RCW/default.aspx?cite=49.44.140