US5338911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 17:32
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.
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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) | 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 |