Patent US4495251A successfully refreshed from Google Patents.
US4495251A
Expired / Lapsed
US
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Shielded plastic microwave oven cavity
Assignee: General Electric Co
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Filing: 1983-02-14
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Granted: 1985-01-22
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Expires: 2003-02-14
Abstract
Abstract A microwave oven cabinet is constructed with plastic materials and has a low resistivity coating on the outside surfaces thereof, which coating is achieved by applying a mixture of a metallic powder and polymer on the surfaces and curing the polymer, followed by an augmentation replacement reaction being effected to replace some of the metallic powder with a more noble metal in such a way that the total volume on the surface of deposited metal exceeds that of the original metal powder replaced at the surface.
Inventors
- 👤 Charles W. Eichelberger
- 👤 Robert J. Wojnarowski
- 👤 Peter I. Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:50
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6426; C; C09; C09D; C09D1/00; C09D5/00; C09D5/24; C09D7/00; C09D7/40; C23; C23C; C23C18/00; C23C18/16; C23C18/1601; C23C18/1633; C23C18/1635; C23C18/1639; C23C18/1641; C23C18/1646; C23C18/165; C23C18/1653; C23C18/54; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12104; Y10T428/12111; Y10T428/12118
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
A plastic microwave oven cabinet having a low resistivity coating on at least a portion of at least one of the inside and outside surfaces thereof, said coating comprising a cured polymer containing therein a first finely divided metallic composition with particles of size greater than about 3 microns and less than about 50 microns and a second metal; the contents of the metal of said first metallic composition and second metal in said cured polymer being about 60-80%, by volume; and a contiguous layer of said second metal on said cured polymer, wherein said second metal is below the metal of said first metallic composition in the activity series.
Claim 2
Dependent Claim
110 words
A plastic microwave oven cabinet having a low resistivity coating on at least a portion of at least one of the inside and outside surfaces thereof, said coating comprising a cured polymer containing therein a first finely divided metallic composition with particles of size greater than about 3 microns and less than about 50 microns and a second metal; the contents of the metal of said first metallic composition and second metal in said cured polymer being about 60-80%, by volume; and a contiguous layer of said second metal on said cured polymer, wherein said second metal is below the metal of said first metallic composition in the activity series.
Claim 3
Dependent Claim
24 words
The plastic microwave oven cabinet of claim 1, wherein the metal of said first metallic composition comprises iron and said second metal comprises copper.
Claim 4
Dependent Claim
17 words
The plastic microwave oven cabinet of claim 1 or 2, wherein said polymer is an acrylic polymer.
Claim 5
Dependent Claim
16 words
The plastic microwave oven cabinet of claim 3, wherein said contents are about 70%, by volume.
Claim 6
Dependent Claim
24 words
The plastic microwave oven cabinet of claim 1, having an electroplated layer of said second metal on said contiguous layer of said second metal.
Claim 7
Dependent Claim
45 words
The plastic microwave oven cabinet of claim 1, further comprising: a layer of said cured polymer, containing said first metallic composition and said second metal, on said contiguous layer of second metal; and a second contiguous layer of second metal on said second cured polymer.
Claim 8
Dependent Claim
29 words
The plastic microwave oven cabinet of claim 1, wherein the metal of said first metallic composition comprises a mixture of about 35-45% of zinc and about 65-55% of nickel.
Claim 9
Dependent Claim
26 words
The plastic microwave oven cabinet of claim 7, wherein the metal of said first metallic composition comprises about 40% of zinc and about 60% of nickel.
Claim 10
Dependent Claim
35 words
The plastic microwave oven cabinet of claim 1, wherein the metal of said first metallic composition is a mixture comprised of about 20-35% of copper, 15-30% of tin, 10-25% of aluminum and 25-40% of iron.
Claim 11
Dependent Claim
37 words
The plastic microwave oven cabinet of claim 9, wherein the metal of said first metallic composition comprises a mixture of about 25-30% of copper, about 20-25% of tin, about 15-20% of aluminum and about 30-35% of iron.
References Cited (Backward Citations)
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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) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |