# US 9,750,377 B2 · Foam generator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,750,377 B2 - Document ID: US9750377B2 - Status: Granted - Kind: B2 - Application number: 14/973,534 - Filed: 2015-12-17 - Published: 2017-06-22 - Granted: 2017-09-05 - Earliest claimed: 2015-12-17 - Applicants: Peter Bai - Inventors: Peter Bai - Web page: https://patentgrep.com/patent/US9750377B2 ## CPC - A47K 5/14: Foam or lather making devices - A47K 5/1211: {using pressure on soap, e.g. with piston (A47K5/1201 takes precedence; using squeeze bottles or the like A47K5/122)} - B05B 7/0037: {including sieves, porous members or the like} - B05B 11/1001: {Piston pumps (B05B11/1087, B05B11/1088, B05B11/109 take precedence)} - B05B 11/1047: {the pump being preassembled as an independent unit before being mounted on the container} - B05B 11/1087: {Combination of liquid and air pumps} - A47K: SANITARY EQUIPMENT; ACCESSORIES THEREFOR, e.g. TOILET ACCESSORIES - B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D) ## Abstract A foam generator includes a container having a liquid. The container includes a container neck. A bubble generator is mounted to the container. The bubble generator has a liquid piston and an air piston that are mechanically connected together to simultaneously dispense the liquid and a flow of air. The liquid piston extends into the container as a bubble generator input stem. The liquid is received into the bubble generator input stem at a liquid piston intake of the bubble generator input stem. The air piston and the liquid piston feed both air and liquid to a mixing chamber that provides both air and liquid to a pair of mixing screens mounted on a bubble generator output stem. The bubble generator output stem is oriented below the bubble generator input stem. An inverted straw cover fits over the liquid piston intake of the input stem. ## Claims ### Claim 1 A foam generator comprising: a container having a liquid, wherein the container includes a container neck; a bubble generator mounted to the container, wherein the bubble generator has a liquid piston and an air piston that are mechanically connected together to simultaneously dispense the liquid and a flow of air, wherein the liquid piston extends into the container as a bubble generator input stem, wherein the liquid is received into the bubble generator input stem at a liquid piston intake of the bubble generator input stem, wherein the air piston and the liquid piston feed both air and liquid to a mixing chamber that provides both air and liquid to a pair of mixing screens mounted on a bubble generator output stem, wherein the bubble generator output stem is oriented below the bubble generator input stem; an inverted straw cover fitting over the liquid piston intake of the input stem, wherein the inverted straw cover has an inverted straw cover fluid channel that draws liquid from the container upward beginning at an inverted straw liquid intake located below the liquid piston intake of the bubble generator input stem; and a locking sleeve locking the bubble generator to the container, wherein the locking sleeve comprises a locking sleeve latching rim that is formed as a triangular plastic hook that hooks onto a bubble generator external sidewall upper edge. ### Claim 2 (depends on 1) The foam generator of claim 1, further including a nozzle removably mounted over the output stem, for directing a flow of generated foam downward. ### Claim 3 (depends on 1) The foam generator of claim 1, further including an air gap cavity formed at an upper end of the inverted straw cover. ### Claim 4 (depends on 1) The foam generator of claim 1, wherein the inverted straw cover fluid channel is formed on a protruding ridge, wherein the protruding ridge extends from an inverted straw cover shoulder. ### Claim 5 (depends on 1) The foam generator of claim 1, further including an annular fluid collection trough located around the bubble generator input stem below a level of the inverted straw liquid intake. ### Claim 6 (depends on 5) The foam generator of claim 5, wherein the annular fluid collection trough is formed between a conical toroid inside trough wall and a conical toroid diagonal trough wall. ### Claim 7 (depends on 6) The foam generator of claim 6, wherein the conical toroid diagonal trough wall is generally diagonally oriented. ### Claim 8 (depends on 6) The foam generator of claim 6, wherein the conical toroid inside trough wall is generally vertically oriented. ### Claim 9 (depends on 6) The foam generator of claim 6, wherein the conical toroid diagonal trough wall is generally diagonally oriented and, wherein the conical toroid inside trough wall is generally vertically oriented. ### Claim 10 (depends on 1) The foam generator of claim 1, further comprising: a plurality of latching rim slots formed on an upper edge of the bubble generator locking sleeve. ### Claim 11 (depends on 1) The foam generator of claim 1, further including a nozzle removably mounted over the output stem, for directing a flow of generated foam downward. ### Claim 12 (depends on 1) The foam generator of claim 1, further including an air gap cavity formed at an upper end of the inverted straw cover. ### Claim 13 (depends on 1) The foam generator of claim 1, wherein the inverted straw cover fluid channel is formed on a protruding ridge, wherein the protruding ridge extends from an inverted straw cover shoulder. ### Claim 14 (depends on 1) The foam generator of claim 1, further including an annular fluid collection trough located around the bubble generator input stem below a level of the inverted straw liquid intake. ### Claim 15 (depends on 14) The foam generator of claim 14, wherein the annular fluid collection trough is formed between a conical toroid inside trough wall and a conical toroid trough wall. ### Claim 16 (depends on 15) The foam generator of claim 15, wherein the conical toroid diagonal trough wall is generally diagonally oriented.