The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 2026
Filed:
Feb. 22, 2022
Ntt Docomo, Inc., Chiyoda-ku, JP;
Kazuma Nozawa, Chiyoda-ku, JP;
Tomohiro Nakagawa, Chiyoda-ku, JP;
Kazuya Sasaki, Chiyoda-ku, JP;
Masayuki Terada, Chiyoda-ku, JP;
NTT DOCOMO, INC., Chiyoda-ku, JP;
Abstract
In a privacy protection data association system including devices (A,B) which maintain user data including a user ID and personal information, each device includes: a de-identification processing unit () which performs an irreversible conversion process on the user ID and a privacy protection process on the personal information and generates de-identified data corresponding to the user data satisfying target user conditions; an encryption unit () which generates double-encrypted de-identified data using a self-encryption key and a partner encryption key in cooperation between its own device and a partner device without disclosing the keys; an aggregation processing unit () which compares data generated by the two devices and aggregates the number of data whose user ID parts match each other, as the number of target users; and a disclosure limitation processing unit () which generates disclosure limited statistical information by performing a disclosure limitation process for an aggregating result.