公开(公告)号：US20190037107A1

公开(公告)日：2019-01-31

申请号：US16073033

申请日：2016-05-27

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

Inventor： Honee L MESA ,  Marvin D NELSON ,  Paul JERAN ,  Chris R GUNNING ,  Erik D NESS

IPC: H04N1/44 ,  G06F21/60 ,  G06F21/44 ,  G06F21/76 ,  H04L9/08 ,  H04N1/00

CPC classification number: H04N1/4426 ,  G06F21/44 ,  G06F21/57 ,  G06F21/608 ,  G06F21/76 ,  H04L9/0897 ,  H04N1/0097 ,  H04N1/4433

Abstract: Examples associated with printer firmware encryption are described. One example printer includes a base firmware module. The base firmware module controls a base function of the printer. The printer also includes a first encrypted firmware module that modifies a first function of the printer. The first encrypted module is inactive until decrypted. A firmware decryption module decrypts the first encrypted module upon receiving a first encryption key.

公开(公告)号：US20210060963A1

公开(公告)日：2021-03-04

申请号：US16644607

申请日：2017-10-18

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

Inventor： Paul JERAN ,  Bartley Mark HIRST ,  Jefferson P WARD ,  Dee CHOU

IPC: B41J2/175

Abstract: In one example, an article for a replaceable printer component includes an integrated circuit device having a device controller, a conductor to supply power to the device controller and to carry a signal to and from the device controller, and a sensor operatively connected to the device controller to sense a voltage and/or a frequency on the conductor. The device controller to send an indication of a sensed voltage and/or a sensed frequency to the printer controller.

公开(公告)号：US20200282735A1

公开(公告)日：2020-09-10

申请号：US16604890

申请日：2017-05-21

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

Inventor： Paul JERAN ,  Bartley Mark HIRST ,  Dee CHOU

IPC: B41J2/175

Abstract: In one example, an integrated circuit device for a replaceable printer component to communicate information about the component to a printer controller when a component with the integrated circuit device is installed in a printer. The integrated circuit device includes a controller, a memory operatively connected to the controller to store and/or generate information about the component, a single pair of conductors to supply power to the controller and to carry data signals to and from the controller, a detector to detect incoming data signals with a signal property associated with the component, and two electrical contacts each connected to one of the conductors to connect the integrated circuit device to a printer controller when a component with the integrated circuit device is installed in a printer.

公开(公告)号：US20240146540A1

公开(公告)日：2024-05-02

申请号：US18548727

申请日：2021-03-01

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

Inventor： Steven T. CASTLE ,  David B. NOVAK ,  Choon Leng TAN ,  Elijah HOULE ,  Paul JERAN ,  Stephen PANSHIN

IPC: H04L9/32

CPC classification number: H04L9/3247

Abstract: A logic circuit, or method using the same, may include a memory storing (i) a plurality of partition groups, each partition group including a plurality of partitions, and (ii) a partition map defining an address and access mode for each of said partitions, defining different access modes for at least some of the partitions. The plurality of partition groups may comprise (i) a general use partition group including a first consumable level counter; (ii) a second use partition group including a second incrementally updatable consumable level counter; and (iii) a guide partition group including a use indicator to indicate which of the first and second consumable level counters to use.