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US4010343A
Expired / Lapsed
US
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Microwave ovens
Assignee: Panasonic Holdings Corp
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Filing: 1975-12-04
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Granted: 1977-03-01
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Expires: 1995-12-04
Abstract
Abstract Microwave oven is provided with an improved door screen which allows an undisturbed clean observation of the heating chamber and at the same time assures safety and durability in use. The door screen comprises an electromagnetic wave shielding means made of a metal mesh interposed between a pair of transparent plates. The metal mesh is constituted by electrically conductive woven wires having a predetermined diameter with the space between the wires also being numerically predetermined.
Inventors
- 👤 Junzo Tanaka
- 👤 Tsuyoshi Takami
- 👤 Toshio Kai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:08
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/76; H05B6/763
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
A microwave oven comprising a body having a heating chamber formed therein, a door mounted on said body and adapted to close and open a front opening of said heating chamber, a microwave generator for emitting microwave energy into said heating chamber and a door screen provided in said door, characterized in that said door screen comprises an electromagnetic wave shielding means composed of a metal mesh interposed between transparent plates, wherein said metal mesh is made of wires having a diameter φ in the range of 0.1 to 0.4 mm with a space l between the wires being in the range of 0.18 to 0.92 mm, and that said diameter and said space are so selected that a ratio l/φ takes a value smaller than values represented by an interpolation curve passing through points corresponding to the values of ratio l/φ equal to 2.2, 3.3 and 4.3 for the values of said diameter φ equal to 0.4, 0.2 and 0.1 mm, respectively.
Claim 2
Dependent Claim
163 words
A microwave oven comprising a body having a heating chamber formed therein, a door mounted on said body and adapted to close and open a front opening of said heating chamber, a microwave generator for emitting microwave energy into said heating chamber and a door screen provided in said door, characterized in that said door screen comprises an electromagnetic wave shielding means composed of a metal mesh interposed between transparent plates, wherein said metal mesh is made of wires having a diameter φ in the range of 0.1 to 0.4 mm with a space l between the wires being in the range of 0.18 to 0.92 mm, and that said diameter and said space are so selected that a ratio l/φ takes a value smaller than values represented by an interpolation curve passing through points corresponding to the values of ratio l/φ equal to 2.2, 3.3 and 4.3 for the values of said diameter φ equal to 0.4, 0.2 and 0.1 mm, respectively.
Claim 3
Dependent Claim
23 words
A microwave oven as set forth in claim 1, wherein said metal mesh is composed of longitudinal and transversal wires of different diameters.
Claim 4
Dependent Claim
23 words
A microwave oven as set forth in claim 1, wherein said metal mesh is composed of longitudinal and transversal wires of different materials.
Claim 5
Dependent Claim
33 words
A microwave oven as set forth in claim 1, wherein said metal mesh is made of a stainless steel material and coated with an oxide layer of less than 5 μ in thickness.
Claim 6
Dependent Claim
29 words
A microwave oven as set forth in claim 1, wherein one of said transparent plates located at the side of said heating chamber is made of chemically strengthened glass.
References Cited (Backward Citations)
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US2958754A
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |