In 2008 a study was published on the values of patents based on a survey asking both inventors and managers what they felt the value of a patent would be. As can be see in the figure below it's a greatly skewed graph with the vast majority of the patents being worth less than €1 Million ($1.5 Million). This value is related to how much an inventor or manager would have sold the patent for as soon as it was issued.
|Gambardella et al, 2008|
But wait! That's not worthless. In fact that's worth a lot of money! Is it? For a person yes. For a company maybe not. R&D is not cheap. Let's say it took three years to develop the technology and a staff of 5 people making €50,000, that alone is a cost of €750,000. You'd barely recoup the expenses of that let alone the materials. However, most economists would argue that those costs are sunk and shouldn't be factored into the cost of the patent. I do agree with this assessment, however there are other costs to consider as well. One of the biggest costs is risk of lawsuits. Which as you can see below are growing at an alarming rate.
In a lot of ways, patents are worthless until you sue someone. There are arguments that a patent has no value until you try to actually use it, or prevent some one from using it. Thus, the fact you're suing means it has inherent worth. Additionally, as there are requirements to pay for patents, a certain fee each year, there is a certain bottom level threshold to indicate the value of a patent. Shifts in this value will impact different patent holders differently. Increasing it towards the end could drive up litigation, while decreasing it, means that no patents will lapse.
So what can we take from this? With the rising numbers of patents, and the rising numbers of law suits, it could be argued that there is a sense of an increased value of patents. However, I think we need to be very careful with this sort of argument. As, we could just be letting bad patents get approved because of changes in the USPTO (there has been more of an increase in the USPTO than at the European Patent Office). In the end, the value of a patent is truly decided in the market when people purchase a product. Unfortunately, the person that gains value out of the patent may not be a true innovator. They could be a troll like Intellectual Ventures http://www.thisamericanlife.org/radio-archives/episode/441/when-patents-attack
A.B. Jaffe & J. Lerner (2006). Innovation and Its Discontent. NJ: Princeton
Alfonso Gambardella, Dietmar Harhoff, Bart Verspagen (2008). The value of
European patents. European Management Review (2008) 5, 69–84.