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I propose the following:
* a tax of amount T is required for granting a patent
* a "liberation" price is calculated as a function of the tax payed, f(T), and assigned to the patent
* if any one entity or consortium of companies, people or nations pays the liberation price to the patent holder, he is considered fully indemnified and the patent is then nullified. The technology is now in the public domain.
* other elements may be used in calculating the liberation price.
a pharmaceutical company invest 100$ millions in medicinal research, the output is patented paying a tax of another 10 millions dollar: the liberation price is set to 10$ millions times 100 = 1 billion.
The resulting medicine cures cancer, so other pharmaceutical companies, states, charities and sick people all pitch in and pay the 1 billion. Great profit was made by the company, but cancer cure is available cheaply and quickly.
A guy has bright idea about some useful gadget related to cellular phones, while he is sitting on the toilet. He gets a patent with 1000$ in patent tax. A single company quickly buys the patent for exclusive use at 10.000 and uses it in production. After the first market success the invention becomes a must, other phone companies decide that it is worth to pay 100.000 to a competitor and liberate the patent, rather than license it individually.
A bright idea is rewarded, but does not become a burden on consumers of manufactured goods.