# US 10,766,272 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 10,766,272 B2 - Document ID: US10766272B2 - Status: Granted - Kind: B2 - Application number: 16/217,140 - Filed: 2018-12-12 - Published: 2019-04-18 - Granted: 2020-09-08 - Earliest claimed: 2018-12-12 - Assignees: Hewlett-Packard Development Company, L.P. - Applicants: Hewlett-Packard Development Company, L.P. - Inventors: Alexander Govyadinov; Tommy D Deskins - Web page: https://patentgrep.com/patent/US10766272B2 ## CPC - B41J 2/18: Ink recirculation systems - B41J 2/1404: {Geometrical characteristics} - B41J 2/14056: {Plural heating elements per ink chamber} - B41J 2/175: Ink supply systems {; Circuit parts therefor} - B41J 2002/14467: {Multiple feed channels per ink chamber} - 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 device may include a series of spaced two-sided walls forming three channels therebetween. Each of the three channels may contain a drop ejector. The device may further include a fluid circulating element to circulate fluid across the drop ejector within each of the channels. ## Claims ### Claim 1 A fluid ejection device, comprising: a series of spaced two-sided walls forming three channels therebetween, each of the three channels containing a drop ejector; and a fluid circulating element to circulate fluid across the drop ejector within each of the channels. ### Claim 2 (depends on 1) The fluid ejection device of claim 1 further comprising: a first fluid passage spanning across first ends of the two-sided walls; a second fluid passage spanning across second ends of the two-sided walls, the fluid circulating element being sandwiched between the first fluid passage and the second fluid passage. ### Claim 3 (depends on 2) The fluid ejection device of claim 2, wherein one of the two-sided walls is sandwiched between the drop ejector and the fluid circulating element. ### Claim 4 (depends on 1) The fluid ejection device of claim 1, wherein the fluid circulating element is on one side of the three channels. ### Claim 5 (depends on 1) The fluid ejection device of claim 1 further comprising: a second series of spaced two-sided walls forming a second series of three channels therebetween, each of the three channels, formed by the walls of the second series, containing a drop ejector; and a second fluid circulating element to circulate fluid across the drop ejector within each of the channels of the second series. ### Claim 6 (depends on 5) The fluid ejection device of claim 5 further comprising a fluid passage between the first series of two-sided walls and the second series of two-sided walls, the fluid passage spanning across ends of the first series of two-sided walls and across ends of the second series of two-sided walls. ### Claim 7 (depends on 6) The fluid ejection device of claim 6, wherein the first fluid circulation element and the second fluid circulation element are to receive fluid from the fluid passage. ### Claim 8 (depends on 7) The fluid ejection device of claim 7 further comprising a fluid feed slot opening within the fluid passage. ### Claim 9 (depends on 7) The fluid ejection device of claim 7, wherein the first series of two-sided walls is staggered along the fluid passage relative to the second series of two-sided walls. ### Claim 10 (depends on 5) The fluid ejection device of claim 5, wherein the second series of two-sided walls is parallel to the first series of two-sided walls. ### Claim 11 (depends on 10) The fluid ejection device of claim 10, wherein the second series of two-sided walls is staggered relative to the first series of two-sided walls. ### Claim 12 (depends on 11) The fluid ejection device of claim 11, wherein one of the two-sided walls of the second series of two-sided walls is centered with respect to the drop ejector contained within one of the three channels of the first series of two-sided walls. ### Claim 13 (depends on 1) The fluid ejection device of claim 1 comprising three adjacent U-shaped channel loopback portions extending around adjacent ends of the two-sided walls. ### Claim 14 (depends on 1) The fluid ejection device of claim 1, wherein the fluid circulating element comprises a thermal resistor. ### Claim 15 (depends on 1) The fluid ejection device of claim 1, wherein each drop ejector comprises a nozzle orifice centered between two of the two-sided walls. ### Claim 16 (depends on 1) The fluid ejection device of claim 1, wherein the drop ejector within each of the three channels is aligned with the drop ejector within each of the other of the three channels in a direction perpendicular to a direction of the three channels. ### Claim 17 (depends on 1) The fluid ejection device of claim 1, wherein the fluid circulating element is to provide continuous circulation of fluid that continually spans both a decap time and a non-decap time of the drop ejecting element. ### Claim 18 A fluid ejection device comprising: a first series of spaced walls comprising a first wall, a second wall and a third wall; a first drop ejector between the first wall and the second wall; a second drop ejector between the second wall and the third wall; a second series of spaced walls comprising a fourth wall, a fifth wall and a sixth wall; a third drop ejector between the fourth wall and the fifth wall; a fourth drop ejector between the fifth wall and the sixth wall, wherein the second series of spaced walls extends parallel to the first series of spaced walls and wherein the first series of spaced walls is staggered relative to the second series of spaced walls. ### Claim 19 (depends on 18) The fluid ejection device of claim 18 further comprising a fluid circulation element to circulate fluid across the first drop ejector and the second drop ejector. ### Claim 20 A method of operating a fluid ejection device, the method comprising: inducing fluid flow, with a fluid circulating element, along consecutive first ends of a series of at least three two-sided walls spaced by channels; inducing fluid flow across a drop ejector within each of the channels; inducing fluid flow along consecutive second ends of the series of the at least three two-sided walls from each of the channels to the fluid circulating element.