Patent US4868362A successfully refreshed from Google Patents.
US4868362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oven with circuit cooling system and magnetic shield system
Assignee: Sharp Corp
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Filing: 1989-02-13
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Granted: 1989-09-19
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Expires: 2009-02-13
Abstract
Abstract A microwave oven comprises a cooling system and a magnetic shield system applied to a plurality of circuit elements. The cooling system comprises a compartment through which air can pass. The compartment is formed by at least one printed circuit board carrying a plurality of circuit elements and a supporting member for supporting the printed circuit board. The circuit elements are cooled by the flow of the air. In addition, the circuit elements are magnetically shielded from a magnetic field generation device such as a magnetic card reader/writer and a high voltage transformer by a shield member. It is possible that the circuit elements are protected from very large quantities of heat emitted by the high voltage transformer. The magnetic card reader/writer may be provided for reading/cooking program information from a magnetic card and writing the same on it. The microwave oven should be controlled according to the cooking program information for cooking purposes.
Inventors
- 👤 Koichi Takeuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:59
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/66; H05B6/666; H05B6/6402; H05B6/642
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
250 words
A microwave oven which comprises: a housing; a door attached to the front portion of said housing; a control panel disposed on said front portion of said housing adjacent to said door; a circuit structure disposed behind said control panel, wherein said circuit structure comprises: a C-shaped supporting member having upper and lower front portion plates secured to a rear portion of said control panel, at top portion plate and a bottom portion plate extending perpendicularly from said control panel, and a rear portion plate connecting said top and bottom portion plates opposite from said front portion plates, wherein said top and bottom portion plates each include top and bottom openings therein, respectively; first and second printed circuit boards secured to first and second side portions of said C-shaped supporting members respectively, so as to form a compartment having said top and bottom openings, each of said first and second printed circuit boards having circuit elements disposed thereon so as to face into said compartment; and a high voltage transformer disposed behind said rear portion plate of said C-shaped supporting member, wherein said top and bottom openings in said C-shaped supporting member provide for air flow through said compartment so as to cool said circuit elements, said C-shaped supporting member reinforces the construction strength of said printed circuit boards, and said rear portion plate of said C-shaped supporting member shields said circuit elements from heat generated by said voltage transformer and from the magnetic field generated by said voltage transformer.
Claim 2
Dependent Claim
250 words
A microwave oven which comprises: a housing; a door attached to the front portion of said housing; a control panel disposed on said front portion of said housing adjacent to said door; a circuit structure disposed behind said control panel, wherein said circuit structure comprises: a C-shaped supporting member having upper and lower front portion plates secured to a rear portion of said control panel, at top portion plate and a bottom portion plate extending perpendicularly from said control panel, and a rear portion plate connecting said top and bottom portion plates opposite from said front portion plates, wherein said top and bottom portion plates each include top and bottom openings therein, respectively; first and second printed circuit boards secured to first and second side portions of said C-shaped supporting members respectively, so as to form a compartment having said top and bottom openings, each of said first and second printed circuit boards having circuit elements disposed thereon so as to face into said compartment; and a high voltage transformer disposed behind said rear portion plate of said C-shaped supporting member, wherein said top and bottom openings in said C-shaped supporting member provide for air flow through said compartment so as to cool said circuit elements, said C-shaped supporting member reinforces the construction strength of said printed circuit boards, and said rear portion plate of said C-shaped supporting member shields said circuit elements from heat generated by said voltage transformer and from the magnetic field generated by said voltage transformer.
Claim 3
Dependent Claim
17 words
The microwave oven as defined in claim 1, wherein said C-shaped supporting member comprises a metallic plate.
Claim 4
Dependent Claim
25 words
The microwave oven as defined in claim 2, wherein said control panel comprises a keyboard and a display secured to a control panel support plate.
Claim 5
Dependent Claim
23 words
The microwave oven as defined in claim 3, wherein said control panel further comprises a card inlet for receiving cooking program information cards.
References Cited (Backward Citations)
US2512138A
Cited
US2682018A
Cited
US3365621A
Cited
US3569656A
Cited
US3912849A
Cited
US4035794A
Cited
US4336569A
Cited
US4339646A
Cited
US4812617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |