US4621180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cavity illumination means for microwave oven
Assignee: Whirlpool Corp
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Filing: 1985-07-08
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Granted: 1986-11-04
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Expires: 2005-07-08
Abstract
Abstract Apparatus for illuminating the interior of a microwave oven cooking cavity, including a light bulb and socket assembly that are inserted into the cavity interior through an opening in a side wall of the cavity during assembly of the oven and a metallic shield member mounted to the cavity wall to surround the bulb. The shield is dimensioned to permit user access to the bulb from within the cavity while preventing the propagation of microwave energy to the region where the bulb is located.
Inventors
- 👤 Mark J. Kristof
- 👤 Donald J. Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:28
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/642; H05B6/6444; H05B6/76; H05B6/766
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
170 words
In a microwave oven having a cooking cavity defined by cavity walls into which microwave energy is selectively introduced, cavity illumination means comprising: an illuminating light bulb; an opening in one of said cavity walls; a mounting plate carrying a light bulb socket on one side thereof; said opening being sufficiently large to receive said light bulb and light bulb socket therethrough from the outside thereof, but being smaller than said mounting plate, such that said mounting plate will be held on the outside of said cavity wall; and means shielding said light bulb from microwave energy within said cavity; said shielding means having an opening therein sufficiently large to permit manual access to said light bulb from the interior of said cavity; whereby, said light bulb is carried on said mounting plate by means of said socket and can be assembled to said cavity from the exterior of said cavity through said opening and said light bulb is readily accessible from the interior of said cavity for replacement purposes.
Claim 2
Dependent Claim
170 words
In a microwave oven having a cooking cavity defined by cavity walls into which microwave energy is selectively introduced, cavity illumination means comprising: an illuminating light bulb; an opening in one of said cavity walls; a mounting plate carrying a light bulb socket on one side thereof; said opening being sufficiently large to receive said light bulb and light bulb socket therethrough from the outside thereof, but being smaller than said mounting plate, such that said mounting plate will be held on the outside of said cavity wall; and means shielding said light bulb from microwave energy within said cavity; said shielding means having an opening therein sufficiently large to permit manual access to said light bulb from the interior of said cavity; whereby, said light bulb is carried on said mounting plate by means of said socket and can be assembled to said cavity from the exterior of said cavity through said opening and said light bulb is readily accessible from the interior of said cavity for replacement purposes.
Claim 3
Dependent Claim
49 words
A microwave oven according to claim 1 wherein said shield comprises a tube into which said light bulb is insertable, said tube being metallic and having an open end dimensioned to substantially prevent the propagation of microwave energy into said tube to the region where said bulb is located.
Claim 4
Dependent Claim
45 words
A microwave oven according to claim 2 wherein said shield has a plurality of small perforations along its length closely spaced and being dimensioned to prevent the propagation of microwave energy into said tube while permitting the propagation of visible light energy from said tube.
Claim 5
Dependent Claim
38 words
A microwave oven according to claim 1 including a translucent cover surrounding said light bulb and shielding means within said cavity, said cover being openable to provide access to said light bulb from the interior of said cavity.
Claim 6
Dependent Claim
148 words
In a microwave oven having a cooking cavity defined by cavity walls into which microwave energy is selectively introduced, cavity illumination means comprising: an illuminating light bulb; an opening in one of said cavity walls; a mounting plate with means for carrying said light bulb; said opening being sufficiently large to receive said light bulb therethrough from the exterior thereof, but being smaller than said mounting plate, such that said mounting plate is securable to the exterior of said cavity wall; a microwave energy shield mounted on the interior of said cavity wall; said light bulb being received in said shield upon insertion through said opening; said shield having an opening therein providing access to said light bulb from the interior of said cavity; whereby, said bulb may be assembled to said cavity from the exterior thereof, and may be removed from said cavity from the interior thereof.
Claim 7
Dependent Claim
148 words
In a microwave oven having a cooking cavity defined by cavity walls into which microwave energy is selectively introduced, cavity illumination means comprising: an illuminating light bulb; an opening in one of said cavity walls; a mounting plate with means for carrying said light bulb; said opening being sufficiently large to receive said light bulb therethrough from the exterior thereof, but being smaller than said mounting plate, such that said mounting plate is securable to the exterior of said cavity wall; a microwave energy shield mounted on the interior of said cavity wall; said light bulb being received in said shield upon insertion through said opening; said shield having an opening therein providing access to said light bulb from the interior of said cavity; whereby, said bulb may be assembled to said cavity from the exterior thereof, and may be removed from said cavity from the interior thereof.
Claim 8
Dependent Claim
44 words
A microwave oven according to claim 5 wherein said shield member comprises a tube with open ends and a flanged opening along its length, said open ends providing access to said light bulb and said flanges engagable with a wall of said cooking cavity.
Claim 9
Dependent Claim
29 words
A microwave oven according to claim 6 wherein said shield member further includes a plurality of small spaced holes along its length to permit transmission of visible light energy.
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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) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |