ALEXANDRIA, Va., June 25 -- United States Patent no. 12,340,997, issued on June 24, was assigned to JEOL Ltd. (Tokyo).

"Mass spectrometry method and information processing device" was invented by Kenji Nagatomo (Tokyo), Masaaki Ubukata (Tokyo) and Ayumi Kubo (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A composition estimation target peak is selected from a mass spectrum of a sample, and a group of measured isotope peaks related to the composition estimation target peak is selected. A composition candidate for the sample is estimated based on the composition estimation target peak. A distribution of a theoretical isotope peak corresponding to the composition candidate is calculated. Presence or abse...