US3866009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal means for preventing the leakage of microwave energy from microwave heating oven
Assignee: TDK Corp
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Filing: 1973-11-21
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Granted: 1975-02-11
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Expires: 1993-11-21
Abstract
Abstract A microwave oven having prevention material for microwave leakage located in the path formed by a gap between the oven door and the oven body. The prevention means may comprise several seals and includes ferromagnetic material as one of the seals. Another seal may be a volumetric resonant cavity, and a metal spring can be provided to minimize the gap.
Inventors
- 👤 Takeshi Ishino
- 👤 Nobuyuki Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:12
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/76; H05B6/763; H01; H01Q; H01Q17/00; H01Q17/001
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
A MICROWAVE OVEN COMPRISING A BODY FORMED BY WALLS AND HAVING AN OPENING IN ONE OF SAID WALLS; A DOOR PROVIDED FOR CLOSING SAID OPENING; SAID BODY AND SAID DOOR IN A CLOSED POSITION DEFINING A PATH THROUGH WHICH MICROWAVE ENERGY MAY LEAK FROM THE INSIDE TO THE OUTSIDE OF SAID OVEN; AND LEAKAGE PREVENTION MEANS COMPRISING A VOLUMETRIC RESONANT CAVITY IN ONE SURFACE OF SAID PATH, AND A LAYER OF FERROMAGNETIC MATERIAL LOCATED DIRECTLY ALONG ONE SURFACE DEFINING SAID PATH AND SPACED FROM SAID CAVITY, THE LALYER OF FERROMAGNETIC MATERIAL INCOMPLETELY BLOCKING THE OPENING OF SAID PATH AND HAVING A SURFACE EXPOSED TO SAID PATH, SAID SURFACE OF SAID FERROMAGNETIC MATERIAL AND OPPOSED SURFACE OF SAID PATH FORMING A GAP THEREBETWEEN, SAID FERROMAGNETIC MATERIAL CONSISTING OF A MIXTURE OF THE POWDER OF FERRITE AND AN ORGANIC HIGH MOLECULAR WEIGHT COMPOUND, SAID FERRITE HAVING THE FORMULA:
Claim 2
Dependent Claim
146 words
A MICROWAVE OVEN COMPRISING A BODY FORMED BY WALLS AND HAVING AN OPENING IN ONE OF SAID WALLS; A DOOR PROVIDED FOR CLOSING SAID OPENING; SAID BODY AND SAID DOOR IN A CLOSED POSITION DEFINING A PATH THROUGH WHICH MICROWAVE ENERGY MAY LEAK FROM THE INSIDE TO THE OUTSIDE OF SAID OVEN; AND LEAKAGE PREVENTION MEANS COMPRISING A VOLUMETRIC RESONANT CAVITY IN ONE SURFACE OF SAID PATH, AND A LAYER OF FERROMAGNETIC MATERIAL LOCATED DIRECTLY ALONG ONE SURFACE DEFINING SAID PATH AND SPACED FROM SAID CAVITY, THE LALYER OF FERROMAGNETIC MATERIAL INCOMPLETELY BLOCKING THE OPENING OF SAID PATH AND HAVING A SURFACE EXPOSED TO SAID PATH, SAID SURFACE OF SAID FERROMAGNETIC MATERIAL AND OPPOSED SURFACE OF SAID PATH FORMING A GAP THEREBETWEEN, SAID FERROMAGNETIC MATERIAL CONSISTING OF A MIXTURE OF THE POWDER OF FERRITE AND AN ORGANIC HIGH MOLECULAR WEIGHT COMPOUND, SAID FERRITE HAVING THE FORMULA:
Claim 3
Dependent Claim
30 words
A microwave oven according to claim 1 in which said leakage prevention means further comprises a metal spring extending completely across said path, thereby forming a seal blocking said path.
Claim 4
Dependent Claim
30 words
A microwave oven according to claim 1 wherein said volumetric resonant cavity is located in said oven body, and said layer of ferromagnetic material is located on said oven body.
Claim 5
Dependent Claim
30 words
A microwave oven according to claim 1 in which said volumetric resonant cavity is located in said door, and said layer of ferromagnetic material is located on said oven body.
Claim 6
Dependent Claim
30 words
A microwave oven according to claim 1 in which said volumetric resonant cavity is located in said oven body and said layer of ferromagnetic material is located on said door.
Claim 7
Dependent Claim
29 words
A microwave oven according to claim 1, in which said volumetric resonant cavity is located in said door, and said layer of ferromagnetic maTerial is located on said door.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |