# US 11,998,137 B2 · Cold brew coffee apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,998,137 B2 - Document ID: US11998137B2 - Status: Granted - Kind: B2 - Application number: 17/541,006 - Filed: 2021-12-02 - Published: 2022-06-02 - Granted: 2024-06-04 - Earliest claimed: 2020-12-02 - Assignees: National Presto Industries, Inc. - Applicants: National Presto Industries, Inc. - Inventors: Aaron J. Munsinger; Michael R. Berge; Justun C. Seymour - Web page: https://patentgrep.com/patent/US11998137B2 ## CPC - A47J 31/20: having immersible, e.g. rotatable, filters - A23F 3/18: Extraction of water soluble tea constituents ({A23F3/166 takes precedence; } isolation of tea flavour or tea oil A23F3/42) - A23F 5/26: Extraction of water soluble constituents {(A23F5/246 takes precedence)} - A47J 31/0615: {with special arrangements for making tea or the like, e.g. where the infusion liquid is kept a certain time in the filter before flowing out} - A47J 31/0636: {suspended from the top of the beverage container so as to remain in contact with the prepared infusion (tea eggs A47G19/16)} - A47J 31/4403: {Constructional details} - A47J 43/046: with tools driven from the bottom side - B01F 33/4533: {supporting the stirring element in one point} - B01F 35/52: Receptacles with two or more compartments - B01F 2101/14: Mixing of ingredients for non-alcoholic beverages; Dissolving sugar in water - A47J: KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES - A23F: COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF - B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06) ## Abstract Disclosed is a cold brew coffee maker and related methods of making cold brew coffee. The cold brew coffee maker can include a rotation assembly, a brew chamber, and a strainer/stirrer assembly. The strainer/stirrer assembly is adapted to be insertable into the brew chamber. The strainer/stirrer assembly having a first and second impeller that are located at a bottom portion of the strainer/stirrer assembly, the first impeller being located externally to the strainer/stirrer assembly and the second impeller located within a chamber formed by the strainer/stirrer assembly. The brew chamber portion of the cold brew coffee maker being filled partially with water, the strainer/stirrer assembly placed into the brew chamber and the brew chamber placed atop the rotation assembly. Ground coffee is added to the chamber located within the strainer/stirrer assembly and the rotation assembly is energized such that the first and second impellers cause the ground coffee and water to be mixed until a desired amount of coffee flavor is imparted upon the water by the ground coffee. ## Claims ### Claim 1 A device for brewing cold brew coffee comprising: a rotation assembly comprising a control and a rotatable magnetic assembly configured to induce a rotating magnetic field at an upper surface of the rotation assembly; a brew chamber; a strainer/stirrer assembly adapted to be insertable into the brew chamber, the strainer/stirrer assembly comprising: a strainer; an inner chamber formed by the strainer, the inner chamber having an open portion located at an upper end of the strainer; an impeller located adjacent to a lower end of the strainer, and comprising a magnetic element that reacts to the rotating magnetic field the impeller rotatably affixed to the strainer such that the impellor rotates independently of the strainer; the impeller comprising a plurality of vanes extending from a central axis toward an outer circumference of the impeller. ### Claim 2 (depends on 1) The device for brewing cold brew coffee of claim 1, wherein the impeller comprises a base plate from which the plurality of vanes extend, the magnetic element being located in the base plate. ### Claim 3 (depends on 1) The device for brewing cold brew coffee of claim 1, wherein a spindle extends outwardly from a strainer base portion, the impeller rotatably mounted on the spindle such that the spindle and the impellor rotate independently of the strainer. ### Claim 4 (depends on 1) The device for brewing cold brew coffee of claim 1, wherein the strainer/stirrer assembly comprises a rim portion which contacts the upper portion of the brew chamber to suspend the strainer from the rim portion, the rim portion adapted to rest on an upper rim of the brew chamber. ### Claim 5 (depends on 4) The device for brewing cold brew coffee of claim 4, wherein the rim portion comprises a moveable cover which when in a lowered position covers the open portion of the inner chamber formed by the strainer. ### Claim 6 (depends on 1) The device for brewing cold brew coffee of claim 1, wherein a spindle extends from a strainer base portion into the inner chamber formed by the strainer, the impeller rotatably mounted on the spindle. ### Claim 7 (depends on 1) The device for brewing cold brew coffee of claim 1, wherein the strainer of the strainer/stirrer assembly comprises a filter portion.