Patent US5338911A successfully refreshed from Google Patents.
US5338911A
Expired / Lapsed
US
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Microwave susceptor with attenuator for heat control
Assignee: Conagra Brands Inc
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Filing: 1990-10-19
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Granted: 1994-08-16
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Expires: 2010-10-19
Abstract
Abstract A thermocompensating susceptor is described comprising a microwave transparent sheet, e.g. paper, paperboard or plastic, having a layer thereon of a dried dispersion comprising a film forming vehicle together with two kinds of dispersed particles including microwave interactive particles such as a metal, metal oxide, carbon or graphite that absorbs microwave energy to produce heat in a microwave oven and electrically nonconductive thermocompensating particles of a mineral hydrate containing bound water of crystallization and having a dissociation temperature between about 100° F. and 500° F., at which temperature the bound water is released therefrom to prevent overheating of the laminate.
Inventors
- 👤 Lawrence C. Brandberg
- 👤 Denise E. Hanson
- 👤 Jeffrey T. Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:28
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3439; B65D2581/344; B65D2581/3447; B65D2581/3448; B65D2581/3463; B65D2581/3464; B65D2581/3471; B65D2581/3472; B65D2581/3474; B65D2581/3477; B65D2581/3478; B65D2581/3479; B65D2581/3483; B65D2581/3486; B65D2581/3494; Y; Y10; Y10S; Y10S99/00; Y10S99/14
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
103 words
A microwave susceptor construction comprising: (a) a backing; and, (b) microwave susceptor material positioned on said backing; said microwave susceptor material including: (i) a sufficient amount of microwave active material for heating of said susceptor material upon absorption of microwave energy of appropriate wavelength; and, (ii) mineral hydrate attenuator material containing bound water; said mineral hydrate attenuator material exhibiting dissociation of water upon a selected absorption of heat; said mineral hydrate attenuator material being provided: in heat conductive relationship with said microwave active material; and, in an amount sufficient to absorb heat and selectively inhibit overheating of said microwave susceptor construction during use.
Claim 2
Dependent Claim
103 words
A microwave susceptor construction comprising: (a) a backing; and, (b) microwave susceptor material positioned on said backing; said microwave susceptor material including: (i) a sufficient amount of microwave active material for heating of said susceptor material upon absorption of microwave energy of appropriate wavelength; and, (ii) mineral hydrate attenuator material containing bound water; said mineral hydrate attenuator material exhibiting dissociation of water upon a selected absorption of heat; said mineral hydrate attenuator material being provided: in heat conductive relationship with said microwave active material; and, in an amount sufficient to absorb heat and selectively inhibit overheating of said microwave susceptor construction during use.
Claim 3
Dependent Claim
32 words
A construction according to claim 1 wherein said mineral hydrate attenuator material is a material which exhibits dissociation of water at a temperature of no greater than about 500° F. (260° C.).
Claim 4
Dependent Claim
15 words
A construction according to claim 2 wherein said backing comprises a flexible sheet of material.
Claim 5
Dependent Claim
25 words
A construction according to claim 2 wherein said backing comprises a sheet of material selected from the group consisting of: paper; paperboard; and, plastic material.
Claim 6
Dependent Claim
41 words
A construction according to claim 1 wherein: (a) said microwave active material comprises a layer of vacuum deposited material; and, (b) said mineral hydrate attenuator material comprises particulate material retained in heat conductive relationship with said layer of vacuum deposited material.
Claim 7
Dependent Claim
27 words
A construction according to claim 5 wherein said mineral hydrate material is retained in heat conductive relationship with said layer of vacuum deposited material by a binder.
Claim 8
Dependent Claim
25 words
A construction according to claim 6 wherein said binder is selected from the group consisting of: acrylic resins; maleic resins; polyvinyl adhesives; and, mixtures thereof.
Claim 9
Dependent Claim
41 words
A construction according to claim 1 wherein: (a) said microwave susceptor material includes a binder; (i) said microwave active material comprising particulate material suspended within said binder; and, (ii) said mineral hydrate attenuator material comprising particulate material suspended within said binder.
Claim 10
Dependent Claim
18 words
A construction according to claim 8 wherein said microwave susceptor material comprises a halftone printing on said backing.
Claim 11
Dependent Claim
26 words
A construction according to claim 8 wherein said binder is selected from the group consisting of: acrylic resins; maleic resins; polyvinyl acetate adhesives; and, mixtures thereof.
Claim 12
Dependent Claim
31 words
A construction according to claim 8 wherein said microwave active particulate material comprises at least one member selected from the group consisting of carbon, microwave active metals; and, microwave active oxides.
Claim 13
Dependent Claim
75 words
A construction according to claim 11 wherein said microwave active material includes at least one member selected from the group consisting of: carbon; nickel; zinc; tin; chromium; iron; gold; silver; magnesium; copper; manganese; aluminum; cobalt; barium; nickel oxides; zinc oxides; tin oxides; chromium oxides; iron oxides; gold oxides; silver oxides; magnesium oxides; copper oxides; manganese oxides; aluminum oxides; cobalt oxides; barium ferrite; zinc ferrite; magnesium ferrite; copper ferrite; silicon carbide; iron carbide and strontium ferrite.
Claim 14
Dependent Claim
92 words
A construction according to claim 8 wherein said mineral hydrate attenuator material includes at least one material selected from the group consisting of: zinc 1 phenol 4 sulfonate octahydrate; thorium hypophosphate hydrate; magnesium chloroplatinate hexahydrate; thorium selenate hydrate; aluminum oxide tribydrate; zinc; zinc iodate dihydrate; thallium sulfate heptahydrate; sodium pyrophosphate hydrate; potassium ruthenate hydrate; manganese chloride tetrahydrate; magnesium iodate tetrahydrate; magnesium bromate hexahydrate; magnesium antimonate hydrate; dysprosium sulfate octahydrate; cobalt orthophosphate octahydrate; calcium ditartrate tetrahydrate; calcium chromate dihydrate; beryllium oxalate tirhydrate; magnesium sulfate heptahydrate; potassium sodium tartrate tetrahydrate; and, zinc sulfate heptahydrate.
Claim 15
Dependent Claim
53 words
A construction according to claim 1 wherein said mineral hydrate attenuator material includes: (a) a first mineral hydrate attenuator having a temperature of dissociation at a first temperature; and, (b) a second mineral hydrate attenuator having a temperature of dissociation at a second temperature; said second temperature being different from said first temperature.
Claim 16
Dependent Claim
32 words
A construction according to claim 14 wherein: (a) said first temperature is no greater than 500° F. (260° C.); and, (b) said second temperature is no greater than 500° F. (260° C.).
Claim 17
Dependent Claim
105 words
A construction according to claim 1 wherein: (a) said backing is microwave transparent and comprises an organic sheet which is stable to heating up to at least about 400° F. (204° C.); (b) said microwave susceptor material comprises a dried dispersion of finely divided particles of at least a first kind and a second kind; (i) said first kind of finely divided particles comprising said microwave active material; and, (ii) said second kind of finely divided particles comprising said mineral attenuator material and having a dissociation temperature at which bound water is released therefrom between about 100° F. (38° C.) and 500° F. (260° C).
Claim 18
Dependent Claim
53 words
A construction according to claim 16 wherein said mineral hydrate attenuator material includes: (a) a first mineral hydrate attenuator having a temperature of dissociation at a first temperature; and, (b) a second mineral hydrate attenuator having a temperature of dissociation at a second temperature; said second temperature being different from said first temperature.
Claim 19
Dependent Claim
35 words
A construction according to claim 16 wherein: (a) said backing comprises paper or paperboard; (b) said dispersion comprises an acrylic resin binder; and, (c) said second kind of finely divided particles comprise aluminum oxide trihydrate.
Claim 20
Dependent Claim
20 words
A construction according to claim 18 wherein said aluminum oxide trihydrate comprises 20-30%, by weight, of said microwave susceptor material.
Claim 21
Dependent Claim
20 words
A construction according to claim 16 wherein said backing includes different amounts of microwave susceptor material in different areas thereof.
Claim 22
Dependent Claim
42 words
A construction according to claim 20 wherein said susceptor material is oriented on said backing in a pattern defining a first, central, region and a second, peripheral, region; said central region including a greater amount of susceptor material than said peripheral region.
Claim 23
Dependent Claim
44 words
A construction according to claim 1 wherein: (a) said mineral hydrate attenuator is electrically nonconductive and has a dissociation temperature of between about 100° F. and 500° F.; and, (b) said mineral hydrate attenuator is retained within said microwave susceptor material by a binder.
Claim 24
Dependent Claim
20 words
A construction according to claim 22 wherein said mineral hydrate attenuator is suspended within a coating applied to said substrate.
Claim 25
Independent Claim
77 words
A method of inhibiting overheating of a microwave interactive material upon exposure to microwave energy; said method including a step of: (a) providing, in heat conductive relationship with the microwave interactive material, a binder film including mineral hydrate attenuator material containing bound water of hydration; the attenuator being provided in an amount sufficient to exhibit dissociation of the bound water, at a selected temperature upon absorption of heat from the microwave interactive susceptor material, to inhibit overheating.
Claim 26
Independent Claim
77 words
A method of inhibiting overheating of a microwave interactive material upon exposure to microwave energy; said method including a step of: (a) providing, in heat conductive relationship with the microwave interactive material, a binder film including mineral hydrate attenuator material containing bound water of hydration; the attenuator being provided in an amount sufficient to exhibit dissociation of the bound water, at a selected temperature upon absorption of heat from the microwave interactive susceptor material, to inhibit overheating.
References Cited (Backward Citations)
US4190757A
Cited
US4264668A
Cited
US4283427A
Cited
US4518651A
Cited
US4640838A
Cited
US4602141A
Cited
US4713510A
Cited
US4917748A
Cited
EP0276654A1
Cited
US4806718A
Cited
US4810845A
Cited
US4818831A
Cited
US4808780A
Cited
US4864089A
Cited
US4876423A
Cited
US4904836A
Cited
US4943456A
Cited
US4914266A
Cited
US4970358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-15 | 1998-02-14 | 1998-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-15 | 2002-02-14 | 2002-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-15 | 2006-02-14 | 2006-08-16 | $7700.00 | Window Closed / Lapsed |