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公开(公告)号：US20150126137A1
公开(公告)日：2015-05-07
申请号：US14072484
申请日：2013-11-05
Applicant: Lexmark International, Inc.
Inventor： Scott Richard Castle , John Thomas Fessler , Keith Bryan Hardin , Michael David Maul , Mark Stephen Underwood , Joseph Kamal Yackzan
IPC: H04B1/40
CPC classification number: H04B1/40 , G06F8/65 , H04B1/1607 , H04B1/1615 , H04B1/44
Abstract: An apparatus for performing operations using low power, including control circuitry; a radio frequency (RF) circuit for receiving RF signals at one or more frequencies; an internal power source; and switching circuitry coupled between the control circuitry and the internal power source, the switching circuitry having a control terminal coupled to an output of the RF circuit. The apparatus is configured in a normal mode of operation and an off mode of operation in which the apparatus is powered down, and wherein in the off mode of operation energy from the received RF signals control a state of the switching circuitry to selectively couple the internal power source with the control circuitry for performing one or more operations.
Abstract translation: 一种用于使用低功率执行操作的装置，包括控制电路; 用于以一个或多个频率接收RF信号的射频（RF）电路; 内部电源; 以及耦合在所述控制电路和所述内部电源之间的开关电路，所述开关电路具有耦合到所述RF电路的输出端的控制端子。 该装置被配置为正常操作模式和关闭操作模式，其中设备断电，并且其中在关闭操作模式下，来自接收到的RF信号的能量控制开关电路的状态以选择性地耦合内部 具有用于执行一个或多个操作的控制电路的电源。
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公开(公告)号：USD911331S1
公开(公告)日：2021-02-23
申请号：US29684253
申请日：2019-03-19
Applicant: Lexmark International, Inc.
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公开(公告)号：USD903756S1
公开(公告)日：2020-12-01
申请号：US29672254
申请日：2018-12-04
Applicant: Lexmark International, Inc.
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公开(公告)号：US20230114075A1
公开(公告)日：2023-04-13
申请号：US18081626
申请日：2022-12-14
Applicant: Lexmark International, Inc.
IPC: G01R33/07 , H01L21/302 , H10N52/00
Abstract: A physically unclonable function is an object that has characteristics that make it extremely difficult or impossible to copy. An array of randomly dispersed hard (magnetized) and soft (non-magnetized) magnetic particles that may be conducting or nonconducting that are disbursed in a binder create a particular magnetic field or capacitive pattern on the surface. This surface magnetic field and capacitive variations can be considered to be a unique pattern similar to fingerprint. The Hall effect prism is a sensor that measures the effects of these patterns by sensing the deformation of currents or electric potential flowing within or around a resistive substrate material that exhibits a substantial Hall effect coefficient.
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公开(公告)号：US11522694B2
公开(公告)日：2022-12-06
申请号：US17184173
申请日：2021-02-24
Applicant: LEXMARK INTERNATIONAL, INC.
Inventor： Scott Richard Castle , Alexander Lloyd Chapman , Keith Bryan Hardin
Abstract: The present invention is a diverse acoustical object containing a range of particles that have acoustical wave impedances that are substantially different from the binder. The particles create a substantially different reflection as an acoustic wave is scattered by the particles. A negative reflection is created when the scattered wave is from a particle that has a wave impedance that is substantially less than the binder impedance. Practically, it may be necessary to encase this material in a thin material that will withstand the fabrication process (e.g., air or silicone elastomer could be encased in glass). If the wavelength is large compared to the encasing material thickness, then the reflection will be more dependent on the interior material. A mixture of materials that generate positive as well as negative reflections within the binder would add to the complexity of the PUF.
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Patent Agency Ranking
公开(公告)号：USD918294S1
公开(公告)日：2021-05-04
申请号：US29684378
申请日：2019-03-20
Applicant: Lexmark International, Inc.
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公开(公告)号：USD914497S1
公开(公告)日：2021-03-30
申请号：US29711375
申请日：2019-10-30
Applicant: Lexmark International, Inc.
Designer： Scott Richard Castle , Hyeob Kim , Robert Henry Muyskens , Thomas Eugene Pangburn
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公开(公告)号：US11632256B2
公开(公告)日：2023-04-18
申请号：US17541003
申请日：2021-12-02
Applicant: Lexmark International, Inc.
Inventor： Scott Richard Castle , Gary Allen Denton , Robert Henry Muyskens , Samuel Leo Rhodus
Abstract: The use of a magnetic particle based “PUF” (Physically Unclonable Function) disk, when read by magnetic sensor(s), as a positional encoder is described. It is often necessary to include a linear or rotary encoder within a device for tracking motor movements, or to enable a closed-loop control algorithm on the motor system. These randomly dispersed magnetic particle disks can be used as a positional encoder, where the speed of movement and the direction of movement may be monitored.
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公开(公告)号：US11416193B2
公开(公告)日：2022-08-16
申请号：US16822365
申请日：2020-03-18
Applicant: LEXMARK INTERNATIONAL, INC.
Inventor： Scott Richard Castle , Gary Allen Denton , Robert Henry Muyskens , Samuel Leo Rhodus , Brant Dennis Nystrom , Carl Edmond Sullivan
Abstract: A physical unclonable function (“PUF”) object can be used to encode the geography or region in which device to which the PUF is attached may operate. Disclosed are two potential ways to regionalize a device using a PUF disk: placing the magnetic sensor at a different radius depending on the region or geography intended for sale; and altering the magnetic structure of the disk to magnetically encode the region into the sensor data.
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公开(公告)号：US11290290B2
公开(公告)日：2022-03-29
申请号：US16822355
申请日：2020-03-18
Applicant: LEXMARK INTERNATIONAL, INC.
Inventor： Scott Richard Castle , Gary Allen Denton , Robert Henry Muyskens , Samuel Leo Rhodus , Brant Dennis Nystrom
Abstract: Magnetic PUFs (Physical Unclonable Function) may utilizes a single 3-axis Hall-effect sensor for enrollment. When a PUF is manufactured, a Hall-effect sensor is used to model the PUF disk and store that data where it may be accessed. This process is called “enrollment.” This invention improves upon the PUF implementation by introducing controlled variability into the enrollment, the reading of the PUF data from the Hall-effect sensors (the number and position of read sensors), the sampling method of the read sensor(s), and the processing of the PUF data.
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