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:
Sep. 10, 2019
Filed:
Oct. 09, 2015
Applicant:
Lexmark International, Inc., Lexington, KY (US);
Inventors:
James Ronald Booth, Nicholasville, KY (US);
Roger Steven Cannon, Nicholasville, KY (US);
Gary Allen Denton, Lexington, KY (US);
James Paul Drummond, Georgetown, KY (US);
Kelly Ann Killeen, Lexington, KY (US);
Assignee:
Lexmark International, Inc., Lexington, KY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/22 (2006.01); G09C 5/00 (2006.01); G06K 19/06 (2006.01); H01F 1/053 (2006.01); H01F 1/08 (2006.01); H04L 9/32 (2006.01); H04L 9/08 (2006.01); G11C 11/02 (2006.01); B22F 1/00 (2006.01);
U.S. Cl.
CPC ...
H01F 1/22 (2013.01); G06K 19/06187 (2013.01); G09C 5/00 (2013.01); H01F 1/053 (2013.01); H01F 1/083 (2013.01); H04L 9/3278 (2013.01); B22F 1/0003 (2013.01); B22F 1/0059 (2013.01); B22F 2202/05 (2013.01); B22F 2301/15 (2013.01); B22F 2301/35 (2013.01); B22F 2301/45 (2013.01); B22F 2304/10 (2013.01); B22F 2304/15 (2013.01); G06K 2019/06253 (2013.01); G11C 11/02 (2013.01); H04L 9/0866 (2013.01); Y04S 40/24 (2013.01);
Abstract
A method of making a physical unclonable function (PUF) having magnetic and non-magnetic particles is disclosed. Measuring both magnetic field and image view makes the PUF difficult to counterfeit. PUF may be incorporated into a user-replaceable supply item for an imaging device. A PUF reader may be incorporated into an imaging device to read the PUF. Other methods are disclosed.