While you can’t patent
an invention that has already been patented, you may be able to patent a
particular function or design of it.
A utility patent is
appropriate for new or improved inventions. Of course, in your situation, it
would be for an improvement on an existing invention and not a patent for a
brand new idea.
A design patent doesn’t
focus on the use of the product at all. Instead, it focuses on the ornamental
features of it. So, if you are creating a brand new look to an existing
invention, then this may be protectable under this type of patent.
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