He made such an announcement during the British premiere of Tesla Model S,
writes Engadget.

We are talking about the disclosure of the Tesla Supercharger device - a network of fast charging stations for Tesla cars - for the sake of creating uniform standards for charging electric vehicles that could be used by all electric vehicle manufacturers in the world. For this, he is ready to sacrifice even some intellectual property regarding the design of Tesla cars themselves.
A prerequisite of partnership for those who wish will be the preservation of the existing principle of “bought a car - refuel all my life for free” and a reasonable contribution to the costs of expanding the Tesla Supercharger network - which, however, should not be too high, because Often, Tesla does not even pay for the rent of land (this is part of the policy of Western countries to support electric cars), and the electricity itself is extracted using solar panels.
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Perhaps it is this “Tesla” step that can be decisive for determining the configuration of the development of the infrastructure of electric refueling stations for the coming years.
On the other hand, competing companies are already developing their standards for charging stations, and it’s not a fact that they will meet Mask’s proposal with enthusiasm - after all, the business model of the price of electricity, which is wired into the price of the car, increases the cost of the already expensive electric cars, which benefits the Mask, working in the premium segment, but hits the interests of companies such as Toyota and Nissan, trying to produce electric cars for all.
UPD
Elon Musk decided to open all Tesla patents