http://www.bib.slu.se/kurser/sss-proj/soka/Patent/esokpatent1.html
och
http://www-umea.slu.se/kontakt/BioPat/default.htm
GenoChoice
http://www.genochoice.com/
Information on patents.
most often when searching for patents. Key words that I have searched under relate to the genes we are interested in trying to patent (for example lignin synthesis genes). There are not in fact so many patents that relate solely to trees.
I also have used
http://www.cambiaip.org/cambiaIP/Home/welcome.htm
which i have found quite useful.