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Utility patents require the payment of maintenance fees while design patents do not require maintenance fees. Utility patents may have a number of claims, but a design patent may have only one claim.
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There are two types of patents basically, there are utility patent and design patent. Utility patents may enjoy the priority based upon the Patent Cooperation Treaty, but the design patent may claim no such priority based upon the Patent Cooperation Treaty. A design is the general appearance of a product. The visual elements that frame the plan include the shape, setup, pattern and ornamentation. A product is something that is manufactured or hand made. You can check cotters patent & trade mark attorneys to find out about patents and how to enlist or register your designs.