According to an article in the May 2006 CACM?quoting Peter Drucker, "no more than one in 100 patents earn enough to pay back its development costs and patent fees, and no more than one in 500 recover all its expenses."
According to an article in the May 2006 CACM?quoting Peter Drucker, "no more than one in 100 patents earn enough to pay back its development costs and patent fees, and no more than one in 500 recover all its expenses."