# US 12,764,837 B2 · Combination microwave and hood system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,764,837 B2 - Document ID: US12764837B2 - Status: Granted - Kind: B2 - Application number: 19/066,773 - Filed: 2025-02-28 - Published: 2025-06-19 - Granted: 2026-10-13 - Earliest claimed: 2016-04-12 - Assignees: Whirlpool Corporation - Applicants: Whirlpool Corporation - Inventors: Owen (XunCai) Zhang; Michael A. Ledford; Stephen Zheng; Xiangxu Liu - Web page: https://patentgrep.com/patent/US12764837B2 ## CPC - H05B 6/6423: {wherein the microwave oven air circulation system is also used as air extracting hood} - F24C 15/2042: {Devices for removing cooking fumes structurally associated with a cooking range e.g. downdraft (F24C15/2007 takes precedence)} - H05B 6/6402: {Aspects relating to the microwave cavity} - H05B 6/6426: {Aspects relating to the exterior of the microwave heating apparatus, e.g. metal casing, power cord} - H05B 2206/042: Microwave oven combined with a toaster or including a toaster - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - F24C: DOMESTIC STOVES OR RANGES (exclusively for solid fuels F24B); DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION ## Abstract A microwave hood system is provided. The microwave hood system includes a microwave oven enclosure defining a cooking cavity therein. A cooking component is positioned within the cooking cavity and configured to emit microwaves. The heating system defines a heating cavity therein, wherein the heating system is coupled to the microwave oven enclosure. A heating element is positioned in the heating cavity. The heating cavity reaches a temperature in a range from about 40° C. to about 80° C. when the heating element is in use. A broiler element is positioned within the heating cavity. The heating cavity reaches a temperature in a range from about hundred and 150° C. to about 300° C. when the broiler element is in use. A dual hood system is also coupled to the microwave hood system. ## Claims ### Claim 1 A microwave oven, comprising: an external enclosure including: a first side portion; a second side portion; a top portion extending from the first side portion to the second side portion; a bottom portion extending from the first side portion to the second side portion and including a bottom surface, corners of the bottom surface defining a horizontal plane; a rear portion extending from the first side portion to the second side portion; and a door; an air filter disposed at the bottom surface, wherein a planar extent of the air filter is at or above the horizontal plane; a cooking cavity located within the external enclosure, wherein the door is operable to enclose the cooking cavity; a cooking component located inside the external enclosure and outside the cooking cavity; at least one vent outlet; at least one vent inlet located on the bottom surface of the external enclosure, wherein the air filter extends across the at least one vent inlet; at least one hood fan located inside the external enclosure, wherein the at least one hood fan is configured to: draw ventilation air through the at least one vent inlet from an area below the external enclosure; and expel the ventilation air through the at least one vent outlet; a cooling air inlet; a cooling air outlet in fluid communication with the cooling air inlet; and a cooling fan in fluid communication with the cooling air inlet and the cooling air outlet, wherein each of the cooling fan, the at least one hood fan, and the cooking component is located between at least one vertical surface of the external enclosure and the cooking cavity, and wherein each of the cooling fan, the at least one hood fan, and the cooking component is located above the air filter and below each of the cooling air outlet and the at least one vent outlet. ### Claim 2 (depends on 1) The microwave oven of claim 1, wherein the at least one vertical surface includes a first vertical surface, and wherein the first vertical surface is defined by an interior surface of one of the first side portion, the second side portion, and the rear portion of the external enclosure. ### Claim 3 (depends on 2) The microwave oven of claim 2, wherein the at least one hood fan is located between the first vertical surface and a second vertical surface, the second vertical surface being defined by a side wall of the cooking cavity. ### Claim 4 (depends on 2) The microwave oven of claim 2, wherein the at least one hood fan is located between the first vertical surface and a second vertical surface, and wherein the second vertical surface is defined by a rear wall of the cooking cavity. ### Claim 5 (depends on 1) The microwave oven of claim 1, wherein the at least one hood fan is configured direct the ventilation air in a vertical direction as the ventilation air flows away from the at least one hood fan and in a horizontal direction as the ventilation air flows above the cooking cavity towards the at least one vent outlet. ### Claim 6 (depends on 1) The microwave oven of claim 1, wherein the at least one hood fan includes a first hood fan and a second hood fan, wherein the first hood fan is located adjacent to the first side portion, and wherein the second hood fan is located adjacent to the rear portion. ### Claim 7 (depends on 1) The microwave oven of claim 1, wherein a distance from the top portion to the at least one hood fan is larger than a distance from the top portion to a top of the cooking cavity. ### Claim 8 (depends on 1) The microwave oven of claim 1, wherein a fan motor powering the at least one hood fan is located vertically below a plane defined by a top of the cooking cavity. ### Claim 9 (depends on 1) The microwave oven of claim 1, wherein the cooling air outlet is adjacent to a forward edge of a top surface of the top portion, and wherein the at least one vent outlet is located between the cooling air inlet and the cooling air outlet. ### Claim 10 (depends on 1) The microwave oven of claim 1, wherein the cooling fan is located between a side wall of the cooking cavity and the first side portion. ### Claim 11 (depends on 1) The microwave oven of claim 1, wherein the cooling fan is configured to direct air in a first vertical direction through the cooling air inlet, through the cooking cavity, in a second vertical direction through a top of the cooking cavity, and in the second vertical direction through the cooling air outlet to be expelled from the external enclosure. ### Claim 12 (depends on 1) The microwave oven of claim 1, wherein the at least one vent outlet includes a first vent outlet and a second vent outlet. ### Claim 13 (depends on 12) The microwave oven of claim 12, wherein at least the first vent outlet is located between the cooling air inlet and the cooling air outlet. ### Claim 14 (depends on 12) The microwave oven of claim 12, wherein each of the first vent outlet and the second vent outlet are located between the cooling air inlet and the cooling air outlet. ### Claim 15 (depends on 14) The microwave oven of claim 14, where each of the first vent outlet, the second vent outlet, the cooling air inlet, and the cooling air outlet are aligned along a forward edge of the top portion. ### Claim 16 (depends on 1) The microwave oven of claim 1, wherein a top of the door is located adjacent to a forward edge of a top surface of the top portion when the door is in a closed position. ### Claim 17 (depends on 1) The microwave oven of claim 1, wherein the at least one vent inlet includes a first vent inlet and a second vent inlet. ### Claim 18 (depends on 1) The microwave oven of claim 1, wherein the at least one hood fan includes a first hood fan and a second hood fan. ### Claim 19 (depends on 18) The microwave oven of claim 18, wherein the first hood fan is located between the first side portion and a first side wall of the cooking cavity, and wherein the second hood fan is located between the second side portion and a second side wall of the cooking cavity. ### Claim 20 (depends on 1) The microwave oven of claim 1, wherein the at least one vent outlet is defined through the top portion proximate to a forward edge. ### Claim 21 (depends on 1) The microwave oven of claim 1, wherein the at least one vent outlet is defined through the top portion proximate to a rear edge. ### Claim 22 (depends on 1) The microwave oven of claim 1, wherein the cooling fan is located between the first side portion and a first side wall of the cooking cavity, and wherein the at least one hood fan includes a first hood fan located between the second side portion and a second side wall of the cooking cavity. ### Claim 23 (depends on 1) The microwave oven of claim 1, wherein the at least one hood fan is adjacent to the rear portion of the external enclosure and a rear surface of the cooking cavity. ### Claim 24 (depends on 1) The microwave oven of claim 1, wherein the at least one hood fan is located between a plane defined by the rear portion of the external enclosure and a plane defined by a rear surface of the cooking cavity. ### Claim 25 (depends on 1) The microwave oven of claim 1, wherein the external enclosure has a vertical dimension of less than about 300 mm. ### Claim 26 (depends on 25) The microwave oven of claim 25, wherein a vertical dimension of the cooking cavity is at least about 68% of the vertical dimension of the external enclosure. ### Claim 27 (depends on 26) The microwave oven of claim 26, wherein a depth of said microwave oven is greater than the vertical dimension of the external enclosure, wherein a volume of the cooking cavity is at least about 35% of a volume of the external enclosure. ### Claim 28 (depends on 1) The microwave oven of claim 1, further comprising: a cover, wherein the at least one vent outlet includes an outside vent outlet located adjacent to a rear edge of the top portion, and wherein the at least one hood fan is configured to expel the ventilation air through the outside vent outlet in an outside venting mode, and further wherein the cover is positioned over the outside vent outlet when in a recirculation mode. ### Claim 29 (depends on 1) The microwave oven of claim 1, wherein the cooling fan is configured to direct cooling air vertically into the external enclosure and expel the cooling air vertically from the external enclosure, and wherein the at least one hood fan is configured to direct the ventilation air vertically into the external enclosure and expel the ventilation air vertically from the external enclosure. ### Claim 30 (depends on 1) The microwave oven of claim 1, wherein the at least one hood fan and the cooling fan are disposed above a horizontal plane defined by a bottom of the cooking cavity. ### Claim 31 A microwave oven, comprising: an external enclosure including: a first side portion; a second side portion; a top portion extending from the first side portion to the second side portion; a bottom portion extending from the first side portion to the second side portion and including a bottom surface, corners of the bottom surface defining a horizontal plane; a rear portion extending from the first side portion to the second side portion; and a door; an air filter disposed at the bottom surface, wherein a planar extent of the air filter is at or above and the horizontal plane; a cooking cavity located within the external enclosure, wherein the door is operable to enclose the cooking cavity; a cooking component located inside the external enclosure and outside the cooking cavity; at least one vent outlet; at least one vent inlet located on the bottom surface of the external enclosure, wherein the air filter extends across the at least one vent inlet; at least one hood fan located inside the external enclosure, wherein the at least one hood fan is configured to: draw ventilation air vertically through the at least one vent inlet from an area below the external enclosure; and expel the ventilation air vertically through the at least one vent outlet; a cooling air inlet; a cooling air outlet in fluid communication with the cooling air inlet; and a cooling fan in fluid communication with the cooling air inlet and the cooling air outlet, wherein each of the cooling fan, the at least one hood fan, and the cooking component is located between at least one vertical surface of the external enclosure and the cooking cavity, and wherein each of the cooling fan, the at least one hood fan, and the cooking component is located above the air filter and below the cooling air inlet.