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Allowed application under patent law refers to a patent application for which the U.S. Patent and Trademark Office examiner has determined that all pending claims meet the conditions for patentability. Patent application is an inventor's request for a patent, which is filed with the U.S. Patent and Trademark Office (PTO). The application should be accompanied by a specification, drawing, the filing fee, and an oath or a declaration. When an application is allowed, the PTO notifies the applicant through a notice of allowability and a notice of allowance. Once a patent application is allowed, a patent normally issues after the applicant has paid the required issue fee.