Henry Ford created the assembly line for car production. The Japanese perfected this idea by introducing their own individual innovations/changes/improvements. Many people are creative however they are not innovate enough to produce their creations practical. Innovation makes creativity practical and efficient. Most inventors fail since they're not innovative enough. Most painters are creative but when they introduce innovation inside their creation/art they become artists. Without creativity there isn't any product/concept that requires implementation and when something new is believed up it needs innovation. Research and development is all about innovation. Sometimes innovation can result in a realization of the creation being impractical therefore this new creative idea could be abandoned along with a new creative idea could be born thus innovation can result in creativity. Innovation is giving a fresh direction to a existing idea.
There's confusion and fuzziness between creativity and innovation because indeed innovation is approximately creating new ways to implement the existing/created concept. Thus both of them have creativity included. Innovation also involves aspects of creativity.
All PhD is for researching innovative ways of doing the old stuff in better and much more efficient ways. Innovation is approximately solving existing problems. At a deeper level innovation is research. At the research institutes they're creating better and better innovations for existing solutions. You don't need to demand a PhD for creativity but for innovation at the innovative highest level a PhD is almost an essential requirement. In reality on the university level innovation is preferred over creativity. For any newly created ideas are doubted till they may be scientifically defined, measured and tested which involves complex and time intensive investigations not forgetting finances. However whatever is already used and it has proved its utility then any improvement through innovation is accepted whole heartedly. My very own invention, 'Vacuum power generators' is based on a solid principle that, 'nature abhors a vacuum'; nevertheless it was rejected in the highest levels of the US government as a result of another sound principle 'The law of conservation of energy'. Regulations of conservation of your energy says that the energy you spent can give back less due to friction. In nature you will find exceptions to the law! Hydrolic pressure, fulcrum power all hand back more energy chances are they take in. And vacuum power will be the fulcrum of wind power. But it's an unproven and too radical an idea and in addition requires a small fortune to make a proto type. Alternatively my little innovation of tweaking just a little improvement in the baby milk bottle I had been in a position to sell right away.
Creativity is essential for innovation to get a product must exist at least in a concept stage for you cannot innovate anything that will not exist. Thus innovation is dependent upon creativity while creativity will not rely on innovation. Although the better success of creativity depends on innovation.