In reference to the patent: US20170153408
Please let me know what kind of Patent this is,
Design or Utility
& If someone want ed to protect the Look of how a new sunglass's lens looks, would that be a design or utility patent
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US20170153408 is an utility patent application. Utility patents describe a process/method of production of an article/device. Design patents protect the visual/aesthetic appearance of an article. If you're planning on patenting a novel way of making the sunglasses lens you'd need to file an utility patent. In your case I feel you just need to protect the design of your lens hence a Design Patent should suffice.
Hope this helped!