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31.发明授权公开(公告)号：US09188907B1
公开(公告)日：2015-11-17
申请号：US14536800
申请日：2014-11-10
Applicant: Lexmark International, Inc.
Inventor： Robert Dan Bennett, III , Gary Allen Denton , Katherine Marie Gilliam , Elliott Vincent Jernigan , Matthew Lee Rogers , Dominique Renee Rowe , Daniel Enrique Alonzo , Royden Thomas Kern
IPC: G03G15/09
CPC classification number: G03G15/0921 , G03G15/0817 , G03G15/0898 , G03G15/0928 , G03G15/0942
Abstract: A developer unit according to one example embodiment includes a housing having a reservoir for storing a developer mix that includes toner and magnetic carrier beads. A magnetic roll includes a stationary core and a sleeve positioned around the core that is rotatable relative to the core. The stationary core includes at least one permanent magnet having circumferentially spaced magnetic poles. An upper and a lower magnetically permeable metal shunt are positioned at each axial end of the magnetic roll. Each upper shunt and each lower shunt is positioned axially outboard of the core and in close proximity to the outer surface of the sleeve. A combination of the upper shunt and the lower shunt at each axial end of the magnetic roll surrounds greater than 180 degrees of the outer surface of the sleeve.
Abstract translation: 根据一个示例性实施例的显影剂单元包括具有用于存储包括调色剂和磁性载体珠的显影剂混合物的储存器的壳体。 磁性卷包括固定芯和围绕芯的套筒，其可相对于芯部旋转。 固定芯包括至少一个具有周向间隔开的磁极的永磁体。 上，下导磁金属分流器位于磁辊的每个轴向端。 每个上分流器和每个下分流器轴向位于芯部的外侧并且紧邻套筒的外表面。 在磁性辊的每个轴向端部处的上部分流器和下部分流器的组合围绕套筒外表面的大于180度。
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公开(公告)号：US20200304325A1
公开(公告)日：2020-09-24
申请号：US16825372
申请日：2020-03-20
Applicant: Lexmark International, Inc.
Inventor： Gary Allen Denton , James Paul Drummond , Robert Henry Musykens
Abstract: The use of two different magnetic coercivity materials in order to have both permanent and non-permanent content on the same security object is described. A security device is presented having a polymer matrix composite containing a uniform distribution of a low coercivity magnetic material such as, but not limited to, magnetite. In conjunction with this uniform background a random distribution of high coercivity magnetic material such as but not limited to an alloy of neodymium, iron, and boron (NdFeB) can be mixed within the first uniform background material to form a durable magnetic signature within the low coercivity uniform background. This can be achieved, for example, by compounding low and high coercivity materials in one compounding operation with one matrix material.
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33.发明申请公开(公告)号：US20200298468A1
公开(公告)日：2020-09-24
申请号：US16820995
申请日：2020-03-17
Applicant: Lexmark International, Inc.
Inventor： James Paul Drummond , Cory Nathan Hammond , Kelly Ann Killeen , Gary Allen Denton
IPC: B29C64/118 , B29C64/393 , B29C31/04 , H04L9/32
Abstract: Disclosed is a process of adding PUF materials with non-repeatable random order to the additive manufacturing process of a product. Preferably, these materials have magnetic characteristics. These characteristics can be detected by a sensor which reads the random pattern and provides a unique signature for the item produced.
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公开(公告)号：US20180167526A1
公开(公告)日：2018-06-14
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
CPC classification number: H04N1/00875 , B41J27/00 , G06F3/1222 , G06F3/1238 , H04N1/4426 , H04N2201/0094
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.
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公开(公告)号：US20180165558A1
公开(公告)日：2018-06-14
申请号：US15378917
申请日：2016-12-14
Applicant: Lexmark International, Inc.
Inventor： Roger Steven Cannon , Gary Allen Denton , Graydon Randall Dodson , Keith Bryan Hardin
CPC classification number: G06K19/06187 , G06K7/087 , H04L9/00
Abstract: Magnetic keys having a plurality of magnetic layers having holes are disclosed. The location and orientation of the holes 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.
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Patent Agency Ranking
公开(公告)号：US09791806B1
公开(公告)日：2017-10-17
申请号：US15137042
申请日：2016-04-25
Applicant: LEXMARK INTERNATIONAL, INC.
CPC classification number: G03G15/0928 , G03G15/0921
Abstract: A developer roll according to one example embodiment includes a core including at least one permanent magnet forming a magnetized portion of the core. A cylindrical sleeve positioned around the core is rotatable relative to the core about an axis of rotation in an operative rotational direction. A release pole of the permanent magnet is positioned to magnetically attract developer mix to an outer circumferential surface of the sleeve to transport developer mix on the surface of the sleeve in the operative rotational direction when the sleeve rotates relative to the core to a release point where a magnetic field of the permanent magnet is insufficient to retain developer mix against the surface of the sleeve. An axial length of the magnetized portion of the core decreases at both axial ends of the core as the magnetized portion of the core approaches the release point in the operative rotational direction.
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37.发明申请公开(公告)号：US20170103834A1
公开(公告)日：2017-04-13
申请号：US14879311
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
CPC classification number: H01F1/22 , B22F1/0003 , B22F1/0059 , B22F2202/05 , B22F2301/15 , B22F2301/35 , B22F2301/45 , B22F2304/10 , B22F2304/15 , G06K19/06187 , G06K2019/06253 , G09C5/00 , G11C11/02 , H01F1/053 , H01F1/083 , H04L9/0866 , H04L9/3278 , Y04S40/24
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.
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公开(公告)号：US20170102668A1
公开(公告)日：2017-04-13
申请号：US15192355
申请日：2016-06-24
Applicant: Lexmark International, Inc.
Inventor： Roger Steven Cannon , Gary Allen Denton , Kelly Ann Killeen , Randal Scott Williamson
IPC: G03G15/00
CPC classification number: G03G21/1676 , G09C1/00 , H04L9/3278
Abstract: A physical unclonable function (PUF) located on a supply item for an imaging device is disclosed. The PUF is advantageously located on the back side of the supply item opposite a handle. This configuration enables a PUF reader to be located at the end of the insertion path of the supply item where it is protected from damage. Other devices are disclosed.
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公开(公告)号：US09608634B1
公开(公告)日：2017-03-28
申请号：US15192399
申请日：2016-06-24
Applicant: Lexmark International, Inc.
Inventor： Gary Allen Denton , Randal Scott Williamson
IPC: G03G21/00 , H03K19/003 , H04L9/32 , G03G21/18 , B41J2/175
CPC classification number: H03K19/003 , B41J2/17543 , B41J2/17546 , G03G21/1875 , G03G2215/0695 , G03G2221/1823 , G09C1/00 , H04L9/3278
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.
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40.发明授权Magnetic roll for a dual component development electrophotographic image forming device 有权用于双组分显影电子照相成像装置的磁辊公开(公告)号：US09575435B2
公开(公告)日：2017-02-21
申请号：US14556291
申请日：2014-12-01
Applicant: Lexmark International, Inc.
Inventor： Gary Allen Denton , Katherine Marie Gilliam , Elliott Vincent Jernigan , Courtney Harrison Soale
CPC classification number: G03G15/0928 , G03G15/0818
Abstract: An outer sleeve of a magnetic roll for a dual component development electrophotographic image forming device according to one example embodiment includes a series of grooves in an outer surface of the outer sleeve. The grooves extend along an axial length of the sleeve and are spaced circumferentially from each other around the outer sleeve. The outer sleeve has a diameter of between 15 mm and 30 mm, inclusive. The grooves are present on the outer surface of the outer sleeve at a groove density of at least 1.91 grooves/mm of the circumference of the outer surface of the outer sleeve and a total indicated runout of the outer sleeve is 0.05 mm or less.
Abstract translation: 根据一个示例性实施例的用于双组分显影电子照相图像形成装置的磁性辊的外套筒包括在外套筒的外表面中的一系列凹槽。 凹槽沿着套筒的轴向长度延伸并且围绕外套筒彼此周向间隔开。 外套筒的直径在15毫米至30毫米之间（含）。 凹槽以外套筒外表面的圆周的至少1.91个凹槽/ mm的凹槽密度存在于外套筒的外表面上，并且外套筒的总指示跳动为0.05mm或更小。
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