Can an invention be corrected once a patent is granted?
Typographical errors may be corrected by filing a certificate of correction. When a patent is defective in certain aspects, the patentee may apply for a reissue patent. New matter cannot be added to the invention. A reissue patent is granted following the examination of the changes made to the invention. It replaces the original patent and is granted only for the remainder years left from the unexpired term.
