Air cooled microwave cooking oven and door

Claim 2

A heating apparatus comprising an enclosure having an access opening therein to receive an article to be heated, a cabinet surrounding said enclosure in spaced relation thereto having an opening adjacent said access opening and having an exhaust opening, a hollow frame door having an outer wall and an inner wall fitted to said enclosure to freely open and close said access opening, said inner wall having a centrally located area having multiple perforations, a window overlying said centrally located perforated area, said outer wall having a centrally located opening in spaced relation with said window, an exhaust aperture near the periphery of said inner wall, an air flow path defined by said centrally located opening in said outer wall, the interior of said hollow door, said exhaust aperture near the periphery of said inner wall in communication with said space between said cabinet and enclosure when said door is closed, and said exhaust opening In said cabinet, a source of high frequency electro magnetic waves in communication with the interior of said enclosure, a metal to metal seal between said door and said enclosure to seal against energy loss from said enclosure through said access opening, and a fan disposed in said exhaust opening in said cabinet for moving air along said air flow path

Claim 3

A heating apparatus as in claim 2 together with an additional window disposed in said centrally located opening in said outer wall, said outer wall having a plurality of openings surrounding said additional window in communication with the interior of said hollow door for providing said centrally located opening in said outer wall.

Claim 4

A microwave cooking apparatus comprising a metallic oven having an access opening therein to receive the foodstuff to be cooked, a cabinet surrounding said oven in spaced relation thereto having an access opening overlying said access opening in said oven and having an exhaust opening, a hollow metallic door having an inner and outer wall in spaced relation fitted to said enclosure to freely open and close said access opening, said inner wall having a perforated area centrally located which bars microwave energy, said outer wall having a centrally located opening in juxtaposition with said perforated area, a screen glass member secured overlying said perforated area for barring cooking vapors, a plurality of outlet apertures through the periphery of said inner wall, a source of high frequency electromagnetic waves in communication with the interior of said oven, a metal to metal seal between said door and said oven surrounding said access opening to seal against energy loss from said oven through said access opening, radiant heating means for surface browning of the food stuffs, an air flow path extending from said centrally located opening in said door through the interior of said door through the outlet apertures at the periphery of said door into the space between said oven and said cabinet and through said exhaust aperture in said cabinet, and a blower for moving cooling air through said air flow path, said blower serving to prevent temperature rise of said outer wall due to the heat from said radiant heating means.

Claim 5

A microwave cooking apparatus comprising a metallic oven having an access opening therein to receive the foodstuff to be cooked, a cabinet surrounding said oven in spaced relation thereto having an access opening overlying said access opening in said oven and having an exhaust opening, a hollow metallic door having an inner and outer wall in spaced relation fitted to said enclosure to freely open and close said access opening, said inner wall having a perforated area centrally located which bars microwave energy, said outer wall having a centrally located opening in juxtaposition with said perforated area, a screen glass member secured overlying said perforated area for barring cooking vapors, a plurality of outlet apertures through the periphery of said inner wall, a source of high frequency electromagnetic waves in communication with the interior of said oven, a metal to metal seal between said door and said oven surrounding said access opening to seal against energy loss from said oven through said access opening, radiant heating means for surface browning of the food stuffs, an air flow path extending from said centrally located opening in said door through the interior of said door through the outlet apertures at the periphery of said door into the space between said oven and said cabinet and through said exhaust aperture in said cabinet, and a blower for moving cooling air through said air flow path, said blower serving to prevent temperature rise of said outer wall due to the heat from said radiant heating means.

Claim 6

A microwave cooking apparatus comprising a metallic oven having an access opening therein to receive the foodstuff to be cooked, a cabinet surrounding said oven in spaced relation thereto having a front access opening overlying said access opening in said oven and an exhaust opening, a hollow metallic door having an inner wall and an outer wall fitted to said oven to freely open and close said access opening, said inner wall having a perforated area centrally located which bars microwave energy, said outer wall having a centrally located window opening overlying said perforated area in said inner wall, first and second screen glass members secured overlying said perforated area in said inner wall and said opening in said outer wall respectively for barring cooking vapors, a plurality of inlet apertures surrounding said second screen glass in communication with the interior of said door, a plurality of exhaust apertures through the periphery of said inner wall, a source of high frequency electromagnetic waves in communication with the interior of said oven, browning means for surface browning of the foodstuff, an airflow path defined by said inlet apertures in said hollow door, the interior of said door, said exhaust apertures in said door, said space between said oven and said cabinet, and said exhaust aperture in said cabinet, a metal to metal seal between said door and said oven to seal against energy loss from said oven through said access opening, a seal mounted in said exhaust apertures in said hollow door substantially impervious to microwave energy and capable of transmitting air, and a fan disposed in said exhaust aperture in said cabinet for moving air through said air flow path, thereby cooling said outer wall of said hollow door and said cabinet.

Claim 7

A microwave cooking apparatus comprising a metallic oven having an access opening therein to receive the foodstuff to be cooked, a cabinet surrounding said oven in spaced relation thereto having a front access opening overlying said access opening in said oven and an exhaust opening, a hollow metallic door having an inner wall and an outer wall fitted to said oven to freely open and close said access opening, said inner wall having a perforated area centrally located which bars microwave energy, said outer wall having a centrally located window opening overlying said perforated area in said inner wall, first and second screen glass members secured overlying said perforated area in said inner wall and said opening in said outer wall respectively for barring cooking vapors, a plurality of inlet apertures surrounding said second screen glass in communication with the interior of said door, a plurality of exhaust apertures through the periphery of said inner wall, a source of high frequency electromagnetic waves in communication with the interior of said oven, browning means for surface browning of the foodstuff, an airflow path defined by said inlet apertures in said hollow door, the interior of said door, said exhaust apertures in said door, said space between said oven and said cabinet, and said exhaust aperture in said cabinet, a metal to metal seal between said door and said oven to seal against energy loss from said oven through said access opening, a seal mounted in said exhaust apertures in said hollow door substantially impervious to microwave energy and capable of transmitting air, and a fan disposed in said exhaust aperture in said cabinet for moving air through said air flow path, thereby cooling said outer wall of said hollow door and said cabinet.