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:
Mar. 27, 2001
Filed:
May. 29, 1997
Sol Aisenberg, Natick, MA (US);
George Freedman, Wayland, MA (US);
A. Ze'ev Hed, Nashua, NH (US);
Richard Pavelle, Winchester, MA (US);
Other;
Abstract
Secure time stamps generated by the inventive apparatus and method include an externally generated time signal, such as a GPS signal, a time stamp serial number, generated through an irreversible process which may not be duplicated by the apparatus, and one or more check sum values used to verify the content of the time stamp parameters or any data file associated with the time stamp. Also disclosed are apparatus and methods for verifying the authenticity of previously generated time stamps in either electronic or tangible form. The time stamp generator apparatus may be implemented as an add-on board to an existing computer system or as a stand alone device which may also include a GPS receiver and a scanner for verifying previously generated time stamps.