Edison invested a great deal of money in DC, hence sick animal torture "presentations" against AC...
Tesla invented many things we use today, you can trace many modern products to some of Tesla patents...unfortunately, often those products are worse then original invention because of greed...for example, fluorescent lighting (Tesla's invention) originaly uses high frequency and dont need any heating elements. Such lamps cannot burnout, only way for them to stop working is when the vacuum seal breaks...of course, how could lighting manufacturers make enormous profits if they sell lamps that you have to buy only once in a lifetime? So, they put heating filaments inside, and voila!
You can use even burnt fluo lamps if you connect them to HF...no problem.
Tesla has around 300 patents, and many inventions he never bothered to patent...for example, there exist corespondence between Tesla and Roentgen from which is evident that Tesla just gave Roentgen his results from x-ray experiments...when Westinghouse could not pay Tesla royalty contract, Tesla allegedly s
"Mr. Westinghouse, you have been my friend, you believed in me when others had no faith; you were brave enough to go ahead... when others lacked courage; you supported me when even your own engineers lacked vision... you have stood by me as a friend...
Here is your contract, and here is my contract. I will tear both of them to pieces, and you will no longer have any troubles from my royalties. Is that sufficient?"
From wikipedia...
"Tesla's inventions and developments include the AC motor, the bifilar coil, various devices that use rotating magnetic fields, the alternating current polyphase power distribution system, the fundamental devices of systems of wireless communication (legal priority for the invention of radio), radio frequency oscillators, devices for voltage magnification by standing waves, robotics, logic gates for secure radio frequency communications, devices for x-rays, apparatus for ozone generation [3], devices for ionized gases, devices for high field emission, devices for charged particle beams, methods for providing extremely low level of resistance to the passage of electrical current,[4] means for increasing the intensity of electrical oscillations, voltage multiplication circuitry, devices for high voltage discharges, devices for lightning protection, the bladeless turbine, and VTOL aircraft."