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. 26, 2009
Filed:
Jun. 01, 2004
Geoffrey B. Rhoads, West Linn, OR (US);
Ammon E. Gustafson, Beaverton, OR (US);
Geoffrey B. Rhoads, West Linn, OR (US);
Ammon E. Gustafson, Beaverton, OR (US);
Digimarc Corporation, Beaverton, OR (US);
Abstract
Two or more digital watermarks are embedded in a document. In one implementation the digital watermarks include characteristics that are chosen so that the watermarks will be affected in different manners if the document is subsequently copied or reproduced. A detection method or mechanism reads two or more of the watermarks and compares their characteristics. In another claim, two or more digital watermarks correspond to characteristics that are evaluated for authentication. Of course, other claims are provided as well.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile