IP Library › Granted Patent US 9,608,634
Granted Patent B1
US 9,608,634 · App. 15/192,399 · Granted Mar 28, 2017

Toothed-rack physical unclonable function

Inventors: Gary Allen Denton (Lexington, KY); Randal Scott Williamson (Georgetown, KY)
Assignee: Lexmark International, Inc.
H03K19/003B41J2/17543B41J2/17546G03G21/1875H04L9/3278G03G2215/0695G03G2221/1823
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Quick Facts
Patent No.
US 9,608,634
App. No.
15/192,399
Granted
Mar 28, 2017
Kind
B1
Abstract

A physical unclonable function (PUF) located on a supply item for an imaging device is disclosed. The PUF has a toothed rack configured to mate with a gear. During reading operations, the gear turns and translates the PUF linearly under a magnetic sensor. This configuration is inexpensive and robust. Other devices are disclosed.

Claims (5)

1. A supply item for an imaging device comprising:

a body; and

a physical unclonable function (PUF) having magnetic particles in a non-magnetic substrate having a toothed rack having a longitudinal axis, the PUF is held captive to the body and constrained to move linearly at least ten millimeters relative to the body parallel to the longitudinal axis.

2. The supply item of claim 1 , further comprising a spring coupled to the PUF to move the PUF to a home position.

3. The supply item of claim 1 , further comprising a handle located on a first side of the body wherein the PUF is located on a second side of the body and the first side is opposite the second side.

Assignments (4)
RELEASE OF SECURITY INTEREST Recorded Jan 18, 2024
From: CHINA CITIC BANK CORPORATION LIMITED, GUANGZHOU BRANCH, AS COLLATERAL AGENT
To: LEXMARK INTERNATIONAL, INC.
Reel/Frame 066345/0026 →
CORRECTIVE ASSIGNMENT TO CORRECT THE INCORRECT U.S. PATENT NUMBER PREVIOUSLY RECORDED AT REEL: 046989 FRAME: 0396. ASSIGNOR(S) HEREBY CONFIRMS THE PATENT SECURITY AGREEMENT. Recorded Oct 24, 2018
From: LEXMARK INTERNATIONAL, INC.
To: CHINA CITIC BANK CORPORATION LIMITED, GUANGZHOU BRANCH, AS COLLATERAL AGENT
Reel/Frame 047760/0795 →
PATENT SECURITY AGREEMENT Recorded Aug 30, 2018
From: LEXMARK INTERNATIONAL, INC.
To: CHINA CITIC BANK CORPORATION LIMITED, GUANGZHOU BRANCH, AS COLLATERAL AGENT
Reel/Frame 046989/0396 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 24, 2016
From: DENTON, GARY ALLEN; WILLIAMSON, RANDAL SCOTT
To: LEXMARK INTERNATIONAL, INC.
Reel/Frame 039006/0761 →
Continuity (1)
Continuation In Part 14879199 · Oct 9, 2015