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Utility and design patents differ because each protects a different element of an object or technology. Utility patents protect the functionality or use of an object, while design patents specifically protect an object's appearance (such as the shape or surface ornamentation).
The format of a utility patent application vs the format of a design patent application is different. Utility and design patents differ in format because they are trying to protect different parts of an object. Utility patents want to protect the functionality or use of an object, while design patents specifically aim to protect an object's appearance.
The written description of a design patent application is very short and a utility patent application written description is much longer.
The drawings of a design patent application focus on showing the shape or surface ornamentation and the drawings of a utility patent application focus on showing the functionality of the invention.
Utility patents and design patents have many differences between their documents’ drawings.
Design patent drawings normally try to show the object's design, rather than the object's functionality. They often have drawings of each side of the object, as well as views of the top and bottom of the object. The drawings are used to convey the actual design of the product, and show little or no detail on how the product functions. Design patent’s drawings also often use dotted lines to convey portions of the drawing which are not included in the patent.
Utility patent drawings are used to convey the functionality of an object (or technology) rather than an object's design, shape, or surface ornamentation. They often contain more detailed drawings which function as diagrams for how the object works. A utility patent may have many more drawings in its documents than a design patent will. Utility patents also use dotted lines in a drawing to convey movement of a specific part of the object rather than inclusion or non-inclusion of protection of that element.
Utility patents and design patents also differ in their documents’ written portions. Because utility patents are focused on the functionality of an object, they often have long written portions to accurately elaborate on how the object functions. Design patents lack these extensive write ups, and instead contain a short description which explains what each of the images represent. Utility patents can also have multiple claims, while design patents can only have a single claim.
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