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:
Oct. 17, 2006
Filed:
Jan. 31, 2002
Shunji Kawamura, Kawasaki, JP;
Taminori Tomita, Sagamihara, JP;
Shunji Kawamura, Kawasaki, JP;
Taminori Tomita, Sagamihara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In order to limit users who can check for validity of a certificate in a system which uses public key certificates, a validity check permit permitting a request to check for validity of the certificate is issued by a permit issuing serverto the applicant of the certificate. The certificate applicant sends the validity check permit to a relevant user when the certificate is used (step). When having a certificate validity checking server check for validity of the certificate, the user sends the validity check permit of the certificate to be checked to the certificate validity checking server (step). The certificate validity checking server verifies the validity check permit (step).