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:
May. 16, 2006
Filed:
May. 16, 2000
Wes Doonan, Fairfax, VA (US);
Albert J. Wettlaufer, Reston, VA (US);
Rone H. Lewis, Franklin Lakes, NJ (US);
Stuart A. Haber, New York, NY (US);
Wes Doonan, Fairfax, VA (US);
Albert J. Wettlaufer, Reston, VA (US);
Rone H. Lewis, Franklin Lakes, NJ (US);
Stuart A. Haber, New York, NY (US);
Surety LLC, Herndon, VA (US);
Abstract
A method for proving the validity of a record digitally signed by a user having a digital certificate issued by a certification authority within a hierarchy of certification authorities. The user signs the record, and obtains the digital certificates and certificate revocation information for all the certification authorities in the chain of the hierarchy extending from the user to the root certification authority. A timestamp is applied to the record, the digital certificates and the certificate revocation information to establish a point in time in which all items were created, current and valid. If, at some later point, one or more of the digital certificates either expire or are revoked, the timestamp serves as evidence of the integrity of the signed record.