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:
Jan. 31, 2012
Filed:
Jul. 10, 2006
Applicants:
Satoshi Saito, Kanagawa, JP;
Yoichi Kanai, Kanagawa, JP;
Inventors:
Satoshi Saito, Kanagawa, JP;
Yoichi Kanai, Kanagawa, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L 9/32 (2006.01);
U.S. Cl.
CPC ...
Abstract
An image forming apparatus for attaching an electronic signature to image data read from a paper document is disclosed. Validity of a first public key certificate that certifies a first signature key is determined. A first electronic signature-for the image data is generated by using the first signature key. The first electronic signature is prevented from being generated in response to an event that it is determined that the first public key certificate is invalid.