Patent US1942354A successfully refreshed from Google Patents.
US4876423A
Expired / Lapsed
US
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Localized microwave radiation heating
Assignee: Dennison Manufacturing Co
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Filing: 1989-01-31
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Granted: 1989-10-24
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Expires: 2009-01-31
Abstract
Abstract A medium formed by a mixture of polymeric binder with conductive and semiconductive particles that can be coated or printed on a substrate to convert electromagnetic radiation to heat without arcing and produce increase heating of foods. Conversion efficiency can be controlled by the choice, thickness, pattern and amount of materials used in the medium. The medium can be used repeatedly without burn out. The conductive particles are typically aluminum, copper, zinc and nickel and the semiconductive particles are typically carbon, titanium carbide and zinc oxide.
Inventors
- 👤 Laurence E. Tighe
- 👤 Tim Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:26
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3439; B65D2581/344; B65D2581/3443; B65D2581/3447; B65D2581/3448; B65D2581/3451; B65D2581/3463; B65D2581/3464; B65D2581/3471; B65D2581/3472; B65D2581/3474; B65D2581/3477; B65D2581/3479; B65D2581/3483; B65D2581/3486; B65D2581/3494; Y; Y10; Y10S; Y10S99/00; Y10S99/14
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
91 words
A microwave susceptor medium which can be coated or selectively printed on a substrate for controlled conversion of microwave radiation to heat without causing arcing during use comprising: a fluid medium comprising a heat resistant polymeric binder and a filler comprising metallic and semiconductor substances dispersed in said fluid medium; wherein said metallic and semiconductor substances are in particulate form, said susceptor having the property that it is heated to a temperature of at least 375° F. within about 4 minutes when exposed to microwave radiation at 700 watts power output.
Claim 2
Dependent Claim
91 words
A microwave susceptor medium which can be coated or selectively printed on a substrate for controlled conversion of microwave radiation to heat without causing arcing during use comprising: a fluid medium comprising a heat resistant polymeric binder and a filler comprising metallic and semiconductor substances dispersed in said fluid medium; wherein said metallic and semiconductor substances are in particulate form, said susceptor having the property that it is heated to a temperature of at least 375° F. within about 4 minutes when exposed to microwave radiation at 700 watts power output.
Claim 3
Dependent Claim
19 words
A susceptor medium as defined in claim 1 wherein the metallic substance is aluminum and the semiconductor is carbon.
Claim 4
Dependent Claim
29 words
A susceptor medium as defined in claim 1 wherein the metallic substance is aluminum and the semiconductor is selected from the group consisting of titanium carbide and zinc oxide.
Claim 5
Dependent Claim
31 words
A susceptor medium as in claim 1 wherein the metallic substance is aluminum and the semiconductor is carbon, wherein the average particle size of aluminum is between 6 to 34 microns.
Claim 6
Dependent Claim
40 words
A susceptor medium as defined in claim 1 wherein said binder is selected from the class consisting of polyimides, polysulfones, polyarylsulfones, polyetherimides, amide-imides, polyethersulfones, polyamides, polycarbonates, epoxies, allyls, phenolics, polyesters, fluorocarbons, acetals, alkyds, furans, melamines, polyphenylenes, polyphenylene sulfides an silicones.
Claim 7
Dependent Claim
34 words
A susceptor medium as defined in claim 1 wherein said fluid medium includes a solvent for the binder and a dispersant to facilitate suspension of said metallic and semiconductor material in said fluid medium.
Claim 8
Dependent Claim
29 words
A susceptor medium as defined in claim 1 wherein the metallic substance is selected from the group consisting of copper, zinc and nickel and the semiconductor material comprises carbon.
Claim 9
Dependent Claim
76 words
A microwave susceptor coating panel which comprises a heat resistant substrate and a susceptor coated on said substrate; said susceptor coating comprising a combination of semiconductor particles and metallic particles and a heat resistant polymeric binder wherein said coating converts microwave radiation to heat sufficient to cause heating to a temperature of at least 375° F. within about 4 minutes at a conventional microwave power output level of 700 watts at a frequency of 2450 Megahertz.
Claim 10
Dependent Claim
76 words
A microwave susceptor coating panel which comprises a heat resistant substrate and a susceptor coated on said substrate; said susceptor coating comprising a combination of semiconductor particles and metallic particles and a heat resistant polymeric binder wherein said coating converts microwave radiation to heat sufficient to cause heating to a temperature of at least 375° F. within about 4 minutes at a conventional microwave power output level of 700 watts at a frequency of 2450 Megahertz.
Claim 11
Dependent Claim
26 words
A panel as defined in claim 8 wherein the weight ratio of metallic particles to semiconductor particles is in the range from about 1:4 to 65:1.
Claim 12
Dependent Claim
44 words
A panel as defined in claim 8 wherein the preferred weight ratio of metallic particles to semiconductor particles is in a range between about 8 to 1 and 32.5 to 1 and wherein the semiconductor particles are carbon black and metallic particles are aluminum.
Claim 13
Dependent Claim
20 words
A panel as defined in claim 8 wherein the semiconductor particles are carbon black and the metallic particles are aluminum.
Claim 14
Dependent Claim
30 words
A susceptor coated panel as in claim 8 wherein the metallic particles comprise aluminum and the semiconductor particles are selected from the group consisting of titanium carbide and zinc oxide.
Claim 15
Dependent Claim
23 words
A susceptor coated panel as defined in claim 8 wherein the semiconductor average particle size is between about 15 nanometers to 45 microns.
Claim 16
Dependent Claim
25 words
A susceptor coated panel as defined in claim 8 having the property that arcing and premature failure are prevented during use in a microwave oven.
Claim 17
Dependent Claim
32 words
A susceptor coated panel as defined in claim 8 wherein said panel is reusable to convert electromagnetic radiation to heat and wherein said panel can be formed to shaped or contoured configuration.
Claim 18
Dependent Claim
46 words
A susceptor medium as in claim 1 wherein the thickness of said fluid medium after said medium is dried is in a range between 6 micron to 250 microns wherein said thickness range facilitates temperature control of said susceptor medium during exposure to said microwave radiation.
Claim 19
Dependent Claim
16 words
A susceptor medium as defined in claim 1 wherein the fluid medium further comprises silicon dioxide.
Claim 20
Dependent Claim
17 words
A susceptor medium as in claim 4 wherein the aluminum is in the form of flaked particles.
Claim 21
Dependent Claim
18 words
A susceptor coated panel as in claim 11 wherein the aluminum is in the form of flaked particles.
Claim 22
Dependent Claim
22 words
A susceptor coated panel as in claim 11 wherein the average particle size of the aluminum is between 6 to 34 microns.
References Cited (Backward Citations)
US4518651A
Cited
US4656325A
Cited
US4612431A
Cited
US4640838A
Cited
US4661671A
Cited
US4751358A
Cited
EP0276654A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |