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    REPLACEABLE PRINT APPARATUS COMPONENTS COMPRISING MEMORY
    81.
    发明申请
    REPLACEABLE PRINT APPARATUS COMPONENTS COMPRISING MEMORY 审中-公开

    公开(公告)号：US20200238720A1

    公开(公告)日：2020-07-30

    申请号：US16606017

    申请日：2017-10-18

    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

    Inventor： Kevin Rourke ,  John McNelly ,  Jefferson P. Ward

    IPC: B41J2/175

    Abstract: In an example, a method comprises fabricating a first validation device for association with a first replaceable print apparatus component. The device may be to form part of circuitry arranged on the first replaceable print apparatus component, and may provide an associated electrically detectable characteristic which varies with the position of at least part of the first validation device. The electrically detectable characteristic may be measured and data indicative of the characteristic may be stored in a first memory. The first replaceable print apparatus component comprising the first device and the first memory may be assembled.

    REPLACEABLE ITEM AUTHENTICATION
    82.
    发明申请
    REPLACEABLE ITEM AUTHENTICATION 审中-公开

    公开(公告)号：US20190342098A1

    公开(公告)日：2019-11-07

    申请号：US16511912

    申请日：2019-07-15

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

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

    IPC: H04L9/32 ,  G06F12/14 ,  B41J2/175

    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 stores authentication values by which the print substance cartridge is authenticated by the printing device, and/or a cryptographic key from which a plurality of authentication values are able to be generated within the print substance cartridge. The memory stores hash values corresponding to the authentication values and by which the authentication values are verifiable by the printing device. The logic is to, in response to a request from the printing device for one of the authentication values and including an identifier, provide the authentication value associated with the identifier to the printing device. The logic is to, in response to a request from the printing device for one or more hash values of the hash values, provide the requested one or more hash values.

    REPLACEABLE ITEM AUTHENTICATION
    83.
    发明申请
    REPLACEABLE ITEM AUTHENTICATION 审中-公开

    公开(公告)号：US20190207765A1

    公开(公告)日：2019-07-04

    申请号：US16295445

    申请日：2019-03-07

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

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

    IPC: H04L9/32 ,  G06F12/14 ,  B41J2/175

    CPC classification number: H04L9/3226 ,  B41J2/17543 ,  B41J2/17546 ,  G06F12/1408 ,  G06F12/1458 ,  G06F2212/402 ,  H04L9/3236 ,  H04L9/3273

    Abstract: Hardware circuitry, in response to receiving a request for an authentication value of a plurality of authentication values of a replaceable item from a host device to which the replaceable item has been connected, determines that the authentication value was not previously sent. The circuitry responsively determines that the replaceable item previously sent a maximum number of unique authentication values of the authentication values. The maximum number of unique authentication values is less than a total number of the authentication values. The circuitry responsively sends the authentication value to the host device. The circuitry, once the authentication value has been sent or will have been sent to the host device, determines that the maximum number of unique authentication values has now been sent, and in response prohibits the authentication values that have not been sent from being sent later.

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