CORVALLIS, Ore. — After just five years of private practice as a patent attorney, Stewart Myers can’t really claim to have seen it all. But he’s seen an awful lot of things he never expected to see. Among the useful — yet unlikely — products created by Myers’ clients are these: The Tree Piece Helmet. A natural-fiber piece of protective headgear made from wood and lined with cork. Handcrafted from carefully selected pieces of wood, the helmets are beautiful as well as functional.  …