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. 15, 2011
Filed:
Sep. 22, 2006
Tomonari Tanaka, Tokyo, JP;
Tomonari Tanaka, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Solutions Corporation, Tokyo, JP;
Abstract
A time stamp obtaining apparatus for maintaining the certificate of the existence of electronic filing document including: a receiving unitreceiving hash value of the document data; a transmitting sectiontransmitting the hash value to time stamp providing apparatus; a storing processing sectioninserting the time stamp encoded with private key in unupdated dataconcerning time stamp received since point to which private key is updated and storing; an update detecting sectiondetecting the update of private key; a calculation sectioncalculating hash value for all time stamps included in the unupdated data; a transmitting sectiontransmitting the hash value; a storing processing sectionmoving the unupdated datato past dataconcerning time stamp received before point to which private key is updated last time when time stamp is received, storing it, and storing the time stamp newly received as new unupdated data; is provided.