US3879595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oven door seal
Assignee: White Consolidated Industries Inc
•
Filing: 1973-01-08
•
Granted: 1975-04-22
•
Expires: 1993-01-08
Abstract
Abstract An electronic device, such as an electronic oven or other device in which electromagnetic radiation is used, has primary, secondary, and tertiary radiation seals for preventing radiation leakage from the device. In one form of the invention a microwave oven has a primary capacitive radiation seal formed between the oven body and the hinged oven door with a secondary radiation absorbent seal in the door about the oven access opening and a tertiary radiation seal including radiation absorbent material in the oven body about the access opening except proximate the hinged edge of the door where the hinge itself forms the tertiary seal.
Inventors
- 👤 John T Lamb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6414; H05B6/6417
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
248 words
An electronic device in which electromagnetic radiation is used, comprising an oven body, a cooking cavity in said oven body, an access opening to said cooking cavity, a door coupled to said oven body and movable between an open position for access to said cooking cavity through said access opening and a closed position cLosing said access opening, said door having at least three edges recessed within an overlapping portion of said oven body when said door is in such closed position, said door having an inwardly facing substantially planar portion generally parallel to the plane of said access opening, and electromagnetic radiation seal means for preventing radiation leakage from said cooking cavity through said access opening when said door is in said closed position, said electromagnetic radiation seal means comprising a capacitive seal adjacent said access opening, said capacitive seal including said substantially planar portion of said door and an opposed portion of said oven body, said portions being electrically conductive, and electrically non-conductive material positioned therebetween and adhered to at least one of said portions, a first electromagnetic radiation absorbent seal including electromagnetic radiation absorbent material in a hollow part forming an indentation in at least one of said door and oven body following said capacitive seal, and a second electromagnetic radiation absorbent seal including electromagnetic radiation absorbent material in a hollow part forming an indentation in at least one of said oven body overlapping portion and door edges following said first electromagnetic radiation absorbent seal.
Claim 2
Dependent Claim
248 words
An electronic device in which electromagnetic radiation is used, comprising an oven body, a cooking cavity in said oven body, an access opening to said cooking cavity, a door coupled to said oven body and movable between an open position for access to said cooking cavity through said access opening and a closed position cLosing said access opening, said door having at least three edges recessed within an overlapping portion of said oven body when said door is in such closed position, said door having an inwardly facing substantially planar portion generally parallel to the plane of said access opening, and electromagnetic radiation seal means for preventing radiation leakage from said cooking cavity through said access opening when said door is in said closed position, said electromagnetic radiation seal means comprising a capacitive seal adjacent said access opening, said capacitive seal including said substantially planar portion of said door and an opposed portion of said oven body, said portions being electrically conductive, and electrically non-conductive material positioned therebetween and adhered to at least one of said portions, a first electromagnetic radiation absorbent seal including electromagnetic radiation absorbent material in a hollow part forming an indentation in at least one of said door and oven body following said capacitive seal, and a second electromagnetic radiation absorbent seal including electromagnetic radiation absorbent material in a hollow part forming an indentation in at least one of said oven body overlapping portion and door edges following said first electromagnetic radiation absorbent seal.
Claim 3
Dependent Claim
248 words
An electronic device in which electromagnetic radiation is used, comprising an oven body, a cooking cavity in said oven body, an access opening to said cooking cavity, a door coupled to said oven body and movable between an open position for access to said cooking cavity through said access opening and a closed position cLosing said access opening, said door having at least three edges recessed within an overlapping portion of said oven body when said door is in such closed position, said door having an inwardly facing substantially planar portion generally parallel to the plane of said access opening, and electromagnetic radiation seal means for preventing radiation leakage from said cooking cavity through said access opening when said door is in said closed position, said electromagnetic radiation seal means comprising a capacitive seal adjacent said access opening, said capacitive seal including said substantially planar portion of said door and an opposed portion of said oven body, said portions being electrically conductive, and electrically non-conductive material positioned therebetween and adhered to at least one of said portions, a first electromagnetic radiation absorbent seal including electromagnetic radiation absorbent material in a hollow part forming an indentation in at least one of said door and oven body following said capacitive seal, and a second electromagnetic radiation absorbent seal including electromagnetic radiation absorbent material in a hollow part forming an indentation in at least one of said oven body overlapping portion and door edges following said first electromagnetic radiation absorbent seal.
Claim 4
Dependent Claim
248 words
An electronic device in which electromagnetic radiation is used, comprising an oven body, a cooking cavity in said oven body, an access opening to said cooking cavity, a door coupled to said oven body and movable between an open position for access to said cooking cavity through said access opening and a closed position cLosing said access opening, said door having at least three edges recessed within an overlapping portion of said oven body when said door is in such closed position, said door having an inwardly facing substantially planar portion generally parallel to the plane of said access opening, and electromagnetic radiation seal means for preventing radiation leakage from said cooking cavity through said access opening when said door is in said closed position, said electromagnetic radiation seal means comprising a capacitive seal adjacent said access opening, said capacitive seal including said substantially planar portion of said door and an opposed portion of said oven body, said portions being electrically conductive, and electrically non-conductive material positioned therebetween and adhered to at least one of said portions, a first electromagnetic radiation absorbent seal including electromagnetic radiation absorbent material in a hollow part forming an indentation in at least one of said door and oven body following said capacitive seal, and a second electromagnetic radiation absorbent seal including electromagnetic radiation absorbent material in a hollow part forming an indentation in at least one of said oven body overlapping portion and door edges following said first electromagnetic radiation absorbent seal.
Claim 5
Dependent Claim
23 words
An electronic device as set forth in claim 2, wherein said electrically non-conductive material comprises epoxy material coating said portion of said door.
Claim 6
Dependent Claim
27 words
An electronic device as set forth in claim 1, wherein one of said electrically conductive portions comprises anodized aluminum, the coating thereon comprising said electrically non-conductive material.
Claim 7
Dependent Claim
30 words
An electronic device as set forth in claim 1, said capacitive seal and said first and second electromagnetic radiation absorbent seals being positioned proximate the plane of said access opening.
Claim 8
Dependent Claim
57 words
An electronic device as set forth in claim 4, said recessed door edges and said overlapping portion of said oven body defining a gap therebetween, said second electromagnetic radiation absorbent seal being positioned proximate said gap, and said recessed door edges and said overlapping portion of said oven body bounding said gap defining a further capacitive seal.
Claim 9
Dependent Claim
20 words
An electronic device as set forth in claim 7, wherein said first and second radiation absorbent material comprise lossy material.
Claim 10
Dependent Claim
20 words
An electronic device as set forth in claim 6, wherein said lossy material comprises ferrite material in a rubber binder.
Claim 11
Dependent Claim
20 words
An electronic device as set forth in claim 6, wherein said lossy material comprises powdered iron in a plastic binder.
Claim 12
Dependent Claim
78 words
An electronic device as set forth in claim 1, wherein said door comprises a conductive door panel mounted on a door frame, said door panel including a raised portion forming one electrically conductive side of said capacitive seal, said electrically non-conductive material comprising epoxy material coating one surface of such raised portion for restraining the latter from direct contact with said opposed portion of said oven body, the latter forming the other conductive side of said capacitive seal.
Claim 13
Dependent Claim
27 words
An electronic device as set forth in claim 10, further comprising radiation absorbent material positioned behind the other surface of said raised portion of said door panel.
Claim 14
Dependent Claim
66 words
An electronic device as set forth in claim 9, wherein said door panel comprises a perforated door panel, and further comprising inner and outer substantially transparent protective means positioned on either side of said door panel, the latter for preventing entry through said perforated door panel to said oven cavity during oven operation and the former for preventing dirt from accumulating on said perforated door panel.
Claim 15
Dependent Claim
28 words
An electronic device as set forth in claim 9, further comprising protective electrically non-conducting material positioned on said door panel on the side remote from said oven cavity.
Claim 16
Dependent Claim
64 words
An electronic device as set forth in claim 1, further compRising a continuous hinge pivotally securing said door to said oven body at an edge thereof, said second electromagnetic radiation absorbent seal being positioned proximate the other of the door edges, and said capacitive seal and said first electromagnetic radiation absorbent seal being positioned about said access opening proximate all of said door edges.
Claim 17
Dependent Claim
19 words
An electronic device as set forth in claim 1, said first radiation absorbent material being positioned in said door.
Claim 18
Dependent Claim
20 words
An electronic device as set forth in claim 14, said second radiation absorbent material being positioned in said oven body.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |