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*'''Utility Patent (Patent for Invention)''': covers new or improved processes, machinery, manufactured products (referred to as articles of manufacture in patent law), and new types of compounds or mixtures (referred to as composition of matter in patent law). The patent awards the right to exclude for twenty years after filing the application and may require maintenance fees.
*'''Reissue Patent''': corrects errors in previously issued '''UPR (Utility, Plant, Design) Patents'''. Reissue Patents may alter who can be excluded from licensing of the patent but not how long the patent holder may enforce exclusion.
