# US 11,440,331 B2 · Fluid ejection device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,440,331 B2 - Document ID: US11440331B2 - Status: Granted - Kind: B2 - Application number: 17/068,443 - Filed: 2020-10-12 - Published: 2021-01-28 - Granted: 2022-09-13 - Earliest claimed: 2018-09-25 - Assignees: Hewlett-Packard Development Company, L.P. - Applicants: Hewlett-Packard Development Company, L.P. - Inventors: Nick McGuinness; Lawrence H White; Paul A Richards - Web page: https://patentgrep.com/patent/US11440331B2 ## CPC - B41J 2/19: for removing air bubbles - B41J 2/1404: {Geometrical characteristics} - B41J 2/175: Ink supply systems {; Circuit parts therefor} - B41J 2/18: Ink recirculation systems - B41J 2/1433: {Structure of nozzle plates} - B41J 2002/14467: {Multiple feed channels per ink chamber} - B41J 2202/11: characterised by specific geometrical characteristics - B41J 2202/12: with ink circulating through the whole print head - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS ## Abstract A fluid ejection system may include a media transport assembly and a printhead assembly having a fluid ejection device opposite the media transport assembly. The fluid ejection device may include a drop ejecting element and a fluid ejection chamber containing the drop ejection element. The fluid ejection chamber has an inlet and an outlet for fluid circulation through the fluid ejection chamber across the drop ejecting element. A particle tolerant architecture is between the inlet and the drop ejecting element. ## Claims ### Claim 1 A fluid ejection system comprising: a media transport assembly; a printhead assembly opposite the media transport assembly, the printhead assembly comprising a fluid ejection device, the fluid ejection device comprising: a drop ejecting element; a fluid ejection chamber containing the drop ejecting element, the fluid ejection chamber having an inlet and an outlet for fluid circulation through the fluid ejection chamber across the drop ejecting element; and a particle tolerant architecture between the inlet and the drop ejecting element. ### Claim 2 (depends on 1) The fluid ejection system of claim 1, wherein the drop ejecting element is between the inlet and the outlet of the fluid ejection chamber. ### Claim 3 (depends on 1) The fluid ejection system of claim 1, further comprising a fluid circulation channel having a first end fluidically connected to a fluid source and an opposite second end connected to the inlet of the fluid ejection chamber, wherein the outlet of the fluid ejection chamber is connected to the fluid source. ### Claim 4 (depends on 3) The fluid ejection system of claim 3, wherein the fluid source comprises a fluid slot. ### Claim 5 (depends on 3) The fluid ejection system of claim 3, wherein the fluid circulation channel includes a first portion and a second portion having the particle tolerant architecture therein, the first portion having a first width and the second portion having a second width greater than the first width at the particle tolerant architecture. ### Claim 6 (depends on 5) The fluid ejection system of claim 5, wherein a minimum distance between the particle tolerant architecture and a first sidewall of the second portion of the fluid circulation channel and a minimum distance between the particle tolerant architecture and a second sidewall of the second portion of the fluid circulation channel are each less than the first width of the first portion of the fluid circulation channel. ### Claim 7 (depends on 5) The fluid ejection system of claim 5, wherein the fluid circulation channel includes a third portion between the first portion and the second portion, the third portion diverging from the first width of the first portion to the second width of the second portion. ### Claim 8 (depends on 7) The fluid ejection system of claim 7, wherein a minimum distance between the particle tolerant architecture and a first sidewall of the third portion of the fluid circulation channel and a minimum distance between the particle tolerant architecture and a second sidewall of the third portion of the fluid circulation channel are each less than the first width of the first portion of the fluid circulation channel. ### Claim 9 (depends on 3) The fluid ejection system of claim 3, further comprising a fluid circulating element, wherein the fluid circulation channel includes a first portion having the fluid circulating element therein and a second portion having the particle tolerant architecture therein, the first portion having a first width at the fluid circulating element and the second portion having a second width greater than the first width at the particle tolerant architecture. ### Claim 10 (depends on 1) The fluid ejection system of claim 1, wherein the particle tolerant architecture comprises a closed curve shape. ### Claim 11 (depends on 1) The fluid ejection system of claim 1, wherein the particle tolerant architecture comprises a polygonal shape. ### Claim 12 (depends on 1) The fluid ejection system of claim 1, further comprising a controller, wherein the controller is to operate in a fluid circulation mode causing fluid circulation through the fluid circulation channel. ### Claim 13 (depends on 1) The fluid ejection system of claim 1, further comprising a fluid supply assembly to supply fluid to the printhead assembly. ### Claim 14 (depends on 1) The fluid ejection system of claim 1, further comprising a controller, the controller to receive data from a host and to output control signals to the drop ejecting element based upon the data. ### Claim 15 (depends on 1) The fluid ejection system of claim 1, wherein the media transport assembly is to position portions of a roll of media opposite the printhead assembly. ### Claim 16 (depends on 1) The fluid ejection system of claim 1, wherein the particle tolerant architecture is located proximate to the drop ejecting element so as to increase back pressure within the fluid ejection chamber and to contain drive energy of a drop ejection in the fluid ejection chamber. ### Claim 17 A fluid ejection system, comprising: a media transport assembly; a printhead assembly opposite the media transport assembly, the printhead assembly comprising a fluid ejection device, the fluid ejection device comprising: a fluid slot; a fluid ejection chamber communicated with the fluid slot; a drop ejecting element within the fluid ejection chamber; a fluid circulation channel including a channel loop, and communicated with the fluid slot and the fluid ejection chamber; and a particle tolerant architecture within the fluid circulation channel between the channel loop and the fluid ejection chamber. ### Claim 18 (depends on 17) The fluid ejection system of claim 17, wherein a width of the fluid circulation channel is increased at the particle tolerant architecture.