WORKING MODELS, PROTOTYPES, AND ILLUSTRATIONS FOR PATENTS
A working model or prototype is not necessary before the filing of a patent application with the United States Patent & Trademark Office. Often, however, those seeking to apply for a patent wil produce hand-drawn sketches or drawings of the invetion, in order to help the drafter of the application write a more detailed, descriptive, and accurate rendition of the characteristics of the invention.
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