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    Logic circuitry
    2.
    发明授权
    Logic circuitry 有权

    公开(公告)号：US11513993B2

    公开(公告)日：2022-11-29

    申请号：US17364052

    申请日：2021-06-30

    Applicant: Hewlett-Packard Development Company, L.P.

    Inventor： Stephen D. Panshin ,  Scott A. Linn

    IPC: G06F13/42 ,  B41J2/175 ,  G03G21/18 ,  G06F13/38 ,  H04N1/00

    Abstract: Replaceable print material supply cartridges for printers are disclosed herein. An example replaceable print material supply cartridge includes logic circuitry that is to determine a position of the replaceable print material supply cartridge by initiating a first voltage on a data contact during a time period, monitoring a timer without reference to a clock signal at a clock contact from a serial data bus, and maintaining a first voltage on the data contact for a duration of time. After expiration of the duration, the logic circuitry is to cause the data contact to assume a second voltage, different than the first voltage, and the logic circuitry is to read data from the memory and cause transmission of a data signal via the serial data bus interface.

    Logic circuitry for print cartridges
    3.
    发明授权
    Logic circuitry for print cartridges 有权

    公开(公告)号：US11256654B2

    公开(公告)日：2022-02-22

    申请号：US16495238

    申请日：2019-02-11

    Applicant: Hewlett-Packard Development Company, L.P.

    Inventor： Stephen D. Panshin ,  Scott A. Linn

    IPC: G06F13/42 ,  B41J2/175 ,  G03G21/18 ,  G06F13/38 ,  H04N1/00

    Abstract: A logic circuitry package for association with a replaceable print apparatus component comprises: logic and a serial data bus interface, wherein the serial data bus interface is to interface with a serial data bus of a print apparatus, and, wherein the logic is, in response to a first command sent to the logic circuitry package via the serial data bus connected to the serial data bus interface, the first command including a time period, to generate a low voltage condition on the serial data bus for a duration based on the time period, and, after the duration, return to a default voltage condition on the serial data bus.

    REPLACEABLE ITEM AUTHENTICATION
    7.
    发明申请
    REPLACEABLE ITEM AUTHENTICATION 审中-公开

    公开(公告)号：US20190329563A1

    公开(公告)日：2019-10-31

    申请号：US16507794

    申请日：2019-07-10

    Applicant: Hewlett-Packard Development Company, L.P.

    Inventor： Stephen D. Panshin ,  Jefferson P. Ward ,  Erik D. Ness

    IPC: B41J2/175 ,  G06F3/12 ,  H04N1/44 ,  G06F21/44 ,  G03G15/08 ,  H04L9/08 ,  G06F21/57

    Abstract: A print substance cartridge for a printing device includes a supply of print substance for the printing device, a non-volatile memory, and logic. The memory store authentication values by which the print substance cartridge is authenticated by the printing device, and/or a cryptographic key from which authentication values are able to be generated within the print substance cartridge. The memory stores hash values corresponding to authentication values and by which the authentication values are verified by the printing device. The logic is to, in response to a request from the printing device for an authentication value, provide the requested authentication value to the printing device. The logic is to, in response to a request from the printing device for the hash value corresponding to the authentication value, provide the hash value corresponding to the authentication value to the printing device.

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