公开(公告)号：US10212300B2

公开(公告)日：2019-02-19

申请号：US15373967

申请日：2016-12-09

Applicant: Lexmark International, Inc.

Inventor： Roger Steven Cannon ,  Gary Allen Denton ,  Graydon Randall Dodson ,  Keith Bryan Hardin

IPC: G03G15/00 ,  H04N1/00 ,  H04N1/44 ,  B41J27/00 ,  G06F3/12

Abstract: Magnetic keys having a plurality of magnetic plates are disclosed. The location and orientation of the magnetic plates are controlled to generate magnetic fields that are of sufficient strength to be reliably read and sufficient complexity to be difficult to counterfeit. The magnetic keys are located on imaging-device supply items along with non-volatile memory devices containing measurements of the magnetic fields that are digitally signed. These supply items are difficult to counterfeit. Other devices are disclosed.

公开(公告)号：US09917699B2

公开(公告)日：2018-03-13

申请号：US14879357

申请日：2015-10-09

Applicant: Lexmark International, Inc.

Inventor： James Ronald Booth ,  Roger Steven Cannon ,  Gary Allen Denton ,  James Paul Drummond ,  Kelly Ann Killeen

IPC: H04L9/32 ,  H04N1/00 ,  G03G15/00 ,  G09C5/00

CPC classification number: H04L9/3278 ,  G03G15/00 ,  G09C5/00 ,  H04L2209/34 ,  H04N1/0084 ,  H04N1/00856

Abstract: A physical unclonable function (PUF) imaged through two faces is disclosed. The PUF is difficult to counterfeit because the view through both faces must be duplicated for a successful 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 systems and methods are disclosed.

公开(公告)号：US11381406B2

公开(公告)日：2022-07-05

申请号：US17114604

申请日：2020-12-08

Applicant: LEXMARK INTERNATIONAL, INC.

Inventor： Gary Allen Denton ,  James Paul Drummond ,  Kelly Ann Killeen

IPC: H04L9/32 ,  B29C45/18 ,  H03K19/003 ,  G09C1/00 ,  B29C45/00 ,  G06V20/80 ,  B29K105/16 ,  B29K101/10 ,  B29K505/12

Abstract: A physical unclonable function is disclosed. A highly random distribution of magnetic particles within a thermoplastic polymer is created by magnetizing magnetizable particles in solid pellet feed material before feeding the solid pellets into an injection molding machine. Other devices and processes are disclosed.

公开(公告)号：US20210203514A1

公开(公告)日：2021-07-01

申请号：US17189177

申请日：2021-03-01

Applicant: Lexmark International, Inc.

Inventor： Gary Allen Denton ,  James Paul Drummond ,  Kelly Ann Killeen

IPC: H04L9/32 ,  B29C45/18 ,  H03K19/003 ,  G09C1/00 ,  G06K9/00 ,  B29C45/00

Abstract: A physical unclonable function is disclosed. A highly random distribution of magnetic particles within a thermoplastic polymer is created by magnetizing magnetizable particles in solid pellet feed material before feeding the solid pellets into an injection molding machine. Other devices and processes are disclosed.

公开(公告)号：US10921393B2

公开(公告)日：2021-02-16

申请号：US16429710

申请日：2019-06-03

Applicant: LEXMARK INTERNATIONAL, INC.

Inventor： William Pohl Corbett ,  Gary Allen Denton ,  James Paul Drummond ,  Keith Bryan Hardin ,  Kelly Ann Killeen ,  Randal Scott Williamson

IPC: G01R33/12 ,  G01R33/00 ,  H04L9/32 ,  G01R33/02 ,  G06K19/06 ,  B41J2/175 ,  G03G21/18 ,  G06K7/08 ,  G01R33/07

Abstract: A system for use in authentication processes is described comprising a physical unclonable function (“PUF”), a substrate, a plurality of magnetized particles randomly dispersed in the substrate, a PUF reader constructed using multiple discrete magnetometer chips that have magnetic field sensors, placed on a circuit card in an array with a sufficient center to center spacing between sensing elements of adjacent magnetometer chips, wherein the PUF reader measures the magnetic field data at multiple locations in close proximity to the magnetized particles. The measured magnetic field data may be compared to previously enrolled data to assess authenticity.

公开(公告)号：US10451998B1

公开(公告)日：2019-10-22

申请号：US16041109

申请日：2018-07-20

Applicant: LEXMARK INTERNATIONAL, INC.

Inventor： Michael Craig Leemhuis ,  Gary Allen Denton

IPC: G03G15/10 ,  G03G15/08

Abstract: A toner level detection assembly for an electrophotographic image forming device according to one example embodiment includes a magnet connected to a rotatable shaft and rotatable with the shaft around an axis of rotation of the shaft. The magnet is pivotable independent of the shaft about a pivot axis that is spaced radially from the axis of rotation. A magnetic sensor is positioned to sense a magnetic field of the magnet at a point in a rotational path of the magnet and is configured to measure an orientation of the magnetic field of the magnet at the point in the rotational path of the magnet. Processing circuitry in communication with the magnetic sensor is configured to determine an estimate of an amount of toner in a toner reservoir correlating with the measured orientation of the magnetic field of the magnet at the point in the rotational path of the magnet.

公开(公告)号：US20190143570A1

公开(公告)日：2019-05-16

申请号：US16170459

申请日：2018-10-25

Applicant: Lexmark International, Inc.

Inventor： Gary Allen Denton ,  James Paul Drummond ,  Kelly Ann Killeen

IPC: B29C45/00 ,  B29B13/08 ,  B29C45/18 ,  B29B13/02 ,  G09C1/00 ,  H03K19/003 ,  H04L9/32

Abstract: A physical unclonable function is disclosed. A highly random distribution of magnetic particles within a thermoplastic polymer is created by magnetizing magnetizable particles in solid pellet feed material before feeding the solid pellets into an injection molding machine. Other devices and processes are disclosed.

公开(公告)号：US20170103791A1

公开(公告)日：2017-04-13

申请号：US14879323

申请日：2015-10-09

Applicant: Lexmark International, Inc.

Inventor： James Ronald Booth ,  Roger Steven Cannon ,  Gary Allen Denton ,  James Paul Drummond ,  Kelly Ann Killeen

IPC: G11C11/16 ,  H04L9/32

CPC classification number: G06F17/289 ,  G11B5/00 ,  G11C7/24 ,  H04L9/3278

Abstract: A rotating magnetic physical unclonable function (PUF) is disclosed. Rotating the PUF enables robust low cost PUF readers. 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 systems and methods are disclosed.

公开(公告)号：US09553582B1

公开(公告)日：2017-01-24

申请号：US14879199

申请日：2015-10-09

Applicant: Lexmark International, Inc.

Inventor： James Ronald Booth ,  Roger Steven Cannon ,  Gary Allen Denton ,  James Paul Drummond ,  Kelly Ann Killeen

IPC: H03K19/003

CPC classification number: H03K19/003 ,  G01R33/1276 ,  G09C1/00 ,  H04L9/3278 ,  H04L2209/12

Abstract: 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 systems are disclosed.

Abstract translation: 公开了具有磁性和非磁性颗粒的物理不可克隆功能（PUF）。 测量磁场和图像视图使得PUF难以伪造。 PUF可以并入用于成像装置的用户可替换的供应物品。 PUF读取器可以并入到成像装置中以读取PUF。 公开了其他系统。

公开(公告)号：US09316951B1

公开(公告)日：2016-04-19

申请号：US14875767

申请日：2015-10-06

Applicant: Lexmark International, Inc.

Inventor： Gary Allen Denton ,  Katherine Marie Gilliam

IPC: G03G15/09

CPC classification number: G03G15/0921

Abstract: A magnetic roll for transporting a dual component developer mix according to one embodiment includes a core having at least one permanent magnet that has a plurality of circumferentially spaced magnetic poles generating a magnetic field. A cylindrical sleeve is positioned around the core. The sleeve is rotatable relative to the core about a rotational axis in an operative rotational direction. At portions of the magnetic roll positioned axially inward from axial ends of the core, a magnitude of a total magnetic field strength of the magnetic field decreases by 1.5 mT/degree or less in the operative rotational direction at a radius of 0.5 mm beyond an outer circumferential surface of the sleeve throughout an area of ±15 degrees from an angular position of the magnetic roll at which a tangential component of the magnetic field is equal to zero at a release pole of the plurality of magnetic poles.

Abstract translation: 根据一个实施例的用于输送双组分显影剂混合物的磁性辊包括具有至少一个具有产生磁场的多个周向间隔开的磁极的永磁体的磁芯。 一个圆柱形套筒围绕着芯子定位。 所述套筒可相对于所述芯围绕旋转轴线在操作旋转方向上旋转。 在从磁芯的轴向端部轴向向内定位的磁辊的部分处，磁场的总磁场强度的大小在操作旋转方向上在超过外部的0.5mm的半径处减小了1.5mT /度或更小 套筒的圆周表面距离磁辊的角度位置的±15度的区域处，在该区域处磁场的切向分量在多个磁极的释放极处等于零。