# US 11,440,247 B2 · Additive manufacturing object conductivity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,440,247 B2 - Document ID: US11440247B2 - Status: Granted - Kind: B2 - Application number: 16/605,064 - Filed: 2018-01-31 - Published: 2021-05-06 - Granted: 2022-09-13 - Earliest claimed: 2018-01-31 - Assignees: Hewlett-Packard Development Company, L.P. - Applicants: Hewlett-Packard Development Company, L.P. - Inventors: Greg Scott Long; Phil D Matlock; Jake Wright; David L Erickson - Web page: https://patentgrep.com/patent/US11440247B2 ## CPC - B29C 64/165: using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber - B33Y 10/00: Processes of additive manufacturing - B33Y 80/00: Products made by additive manufacturing - B29K 2995/0005: Conductive - B33Y 70/00: Materials specially adapted for additive manufacturing - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS ## Abstract Some examples include an additive manufacturing method for controlling electrostatic discharge of a build object. The method includes receiving data related to a build object, the data including conductivity data, selectively depositing a first portion of a printing agent onto a build material layer in a pattern of an object layer of a build object, the printing agent being electrically conductive at a predetermined dosage, the first portion deposited at less than the predetermined dosage, selectively depositing a second portion of the printing agent onto the build material layer at an area of the pattern, the printing agent at the area deposited at or above the predetermined dosage, and applying fusing energy to form the object layer, the object layer of the build object including a shell formed at the area and a core, the shell being electrically conductive and the core being electrically non-conductive. ## Claims ### Claim 1 An additive manufacturing method for controlling electrostatic discharge of a build object, the method comprising: receiving data related to the build object, the data including conductivity data; selectively depositing a first portion of a printing agent onto a build material layer in a pattern of an object layer of the build object, the printing agent being electrically conductive at a predetermined dosage, the first portion deposited at less than the predetermined dosage; selectively depositing a second portion of the printing agent onto the build material layer at an area of the pattern, the printing agent at the area deposited at or above the predetermined dosage; and applying fusing energy to form the object layer, the object layer of the build object including a shell formed at the area and a core, the shell being electrically conductive and the core being electrically non-conductive. ### Claim 2 (depends on 1) The additive manufacturing method of claim 1, wherein the first and second portions are deposited in a single pass of a print agent dispenser across the build material layer. ### Claim 3 (depends on 1) The additive manufacturing method of claim 1, wherein the first portion is deposited prior to the second portion. ### Claim 4 (depends on 1) The additive manufacturing method of claim 1, wherein the second portion of the printing agent is deposited with the first portion. ### Claim 5 (depends on 1) The additive manufacturing method of claim 1, wherein the area is a perimeter of the pattern. ### Claim 6 An additive manufacturing method for controlling electrostatic discharge of a build object, the method comprising: determining printing agent application parameters of electrostatic discharge of the build object; depositing a first portion of a printing agent onto a build material layer in a pattern of an object layer of the build object, the printing agent being electrically conductive at a predetermined dosage, the first portion deposited at a dosage below the predetermined dosage; depositing a second portion of the printing agent onto the build material layer at an area of the pattern, the printing agent at the area being at least the predetermined dosage; and applying fusing energy to form the object layer, the object layer of the build object including a shell formed at the area and a core in the pattern, the shell having a first electrical conductivity greater than a second conductivity of the core. ### Claim 7 (depends on 6) The additive manufacturing method of claim 6, comprising: depositing at least one additional portion of the printing agent to a selective area of the build material layer. ### Claim 8 (depends on 6) The additive manufacturing method of claim 6, wherein determining the printing agent application parameters includes determining a contone level of the second portion. ### Claim 9 (depends on 6) The additive manufacturing method of claim 6, wherein determining the printing agent application parameters includes determining a position of the area. ### Claim 10 (depends on 6) The additive manufacturing method of claim 6, wherein the depositing the second portion of the printing agent increases the conductivity of the first portion to the first electrical conductivity. ### Claim 11 (depends on 6) The additive manufacturing method of claim 6, wherein the build material layer at the shell has a higher concentration of the printing agent than the core. ### Claim 12 An additive manufactured build object comprising: a shell having a first conductivity, the shell having the first conductivity formed with an electrically conductive printing agent having a dosage in a region of the shell at or exceeding a predetermined electrically conductive dosage, the shell including an exterior surface of the additive manufactured build object; and a core having a second conductivity less than the first conductivity, the core having the second conductivity formed with the electricallyconductive printing agent having an electrically non-conductive dosage in a region of the core at less than the predetermined electrically conductive dosage. ### Claim 13 (depends on 12) The additive manufactured build object of claim 12, wherein the shell at least partially encloses the core. ### Claim 14 (depends on 12) The additive manufactured build object of claim 12, wherein the shell has a thickness to provide the second conductivity. ### Claim 15 (depends on 12) The additive manufactured build object of claim 12, wherein the core is encapsulated by the shell. ### Claim 16 (depends on 12) The additive manufactured build object of claim 12, wherein the shell provides an electrostatic dissipative perimeter of the additive manufacturing build object. ### Claim 17 (depends on 1) The additive manufacturing method of claim 1, wherein the printing agent comprises a fusing agent and a conductivity agent. ### Claim 18 (depends on 1) The additive manufacturing method of claim 1, wherein the second portion of the printing agent forms a conductive matrix that becomes interlocked with a fused build material in the build material layer. ### Claim 19 (depends on 1) The additive manufacturing method of claim 1, wherein the shell fully or partially encloses the core. ### Claim 20 (depends on 6) The additive manufacturing method of claim 6, wherein the printing agent comprises a fusing agent and a conductivity agent.