US4917748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making microwave heatable materials
Assignee: Waddingtons Cartons Ltd
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Filing: 1988-01-19
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Granted: 1990-04-17
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Expires: 2008-01-19
Abstract
Abstract The invention provides that receptor films for use in microwave ovens for the browning and crisping of foodstuff are created by forming a composition which is liquid in nature and contains interactive particles. The composition is laid down in order to form a film which is then dried in order to fix the interactive particles in distributed form so that they will behave as an interactive layer when subjected to microwave radiation. It is suggested that the interactive particle layer should be covered by a protective layer such as heat curable varnish in order to isolate the particles from the foodstuff which will be adjacent thereto to be crisped and browned thereby. The composition comprises a cross linking and heat resistant resin acting as a binder so that when the composition is applied on a receiving surface, it is cured for example by subjecting it to heat to fix the particles in distributed condition.
Inventors
- 👤 Peter Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:14
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3439; B65D2581/344; B65D2581/3443; B65D2581/3448; B65D2581/3463; B65D2581/3464; B65D2581/3471; B65D2581/3472; B65D2581/3477; B65D2581/3479; B65D2581/3483; B65D2581/3486; B65D2581/3494
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
130 words
A method of producing a microwave interactive sheet material for use in microwave cooking comprising the steps of: (a) providing a receiving sheet; (b) applying to a surface of the receiving sheet a composition comprising a liquid component in which are mixed in suspension microwave interactive particles in an amount not greater than 50% of said composition so as to distribute the composition over the surface; and (c) drying the liquid component of the composition to leave the particles so distributed so as to fix the particles in such distribution and so as to ensure that the particles form a layer to be subjected to microwave radiation, whereby upon drying of the liquid component, the amount of particles is sufficient to provide cooking of foodstuff placed in close proximity thereto,
Claim 2
Independent Claim
130 words
A method of producing a microwave interactive sheet material for use in microwave cooking comprising the steps of: (a) providing a receiving sheet; (b) applying to a surface of the receiving sheet a composition comprising a liquid component in which are mixed in suspension microwave interactive particles in an amount not greater than 50% of said composition so as to distribute the composition over the surface; and (c) drying the liquid component of the composition to leave the particles so distributed so as to fix the particles in such distribution and so as to ensure that the particles form a layer to be subjected to microwave radiation, whereby upon drying of the liquid component, the amount of particles is sufficient to provide cooking of foodstuff placed in close proximity thereto,
Claim 3
Dependent Claim
21 words
A method according to claim 1, wherein the receiving sheet comprises a sheet of cardboard material or a synthetic plastics material.
Claim 4
Dependent Claim
52 words
A method according to claim 1 or 2, wherein the receiving surface comprises the surface or part of the surface of a receptacle which is for containing foodstuff to be cooked in a microwave oven, the arrangement being that when the receptacle contains the foodstuff, such foodstuff is adjacent said receiving surface.
Claim 5
Dependent Claim
23 words
A method according to claim 1, including the step of stirring the composition prior to the application of same to the receiving surface.
Claim 6
Dependent Claim
23 words
A method according to claim 1, including the step of applying the composition to the receiving surface by means of a printing step.
Claim 7
Dependent Claim
20 words
A method according to claim 5, wherein the printing step comprises gravure, roller coating, litho letterpress or silk screen printing.
Claim 8
Dependent Claim
22 words
A method according to claim 1 wherein said composition comprises as a major part of the liquid component, a cross-linking synthetic resin.
Claim 9
Dependent Claim
17 words
A method according to claim 7 wherein the cross-linking resin is dried by the application of heat.
Claim 10
Dependent Claim
16 words
A method according to claim 7 wherein the cross-linking resin is a silicone modified polyester resin.
Claim 11
Dependent Claim
20 words
A method according to claim 9, wherein the silicone modified polyester resin includes a catalyst to accelerate the curing thereof.
Claim 12
Dependent Claim
15 words
A method according to any of claim 7, wherein the said composition includes P.T.F.E. particles.
Claim 13
Dependent Claim
58 words
A method according to claim 1, wherein the particles comprise one or any combination of the following: metallic particles such as aluminium, copper, gold, tin, zinc particles; metallic oxide particles such as barium dodecairon nonadecaoxide, di-iron nickel tetra oxide, manganese di-iron oxide, zinc di-iron oxide, carbon particles such as natural and synthetic graphite particles, and carbon black particles.
Claim 14
Dependent Claim
22 words
A method according to claim 1, wherein the particles are of a size in the range from submicron up to 10 μ.
Claim 15
Dependent Claim
25 words
A method according to claim 1, wherein the liquid component and particles are contained in the composition in the ratio range 1:1 to 9:9 inclusive.
Claim 16
Dependent Claim
25 words
A method according to claim 1, including the step of applying the composition repeatedly to build up the thickness of same on the receiving surface.
Claim 17
Dependent Claim
21 words
A method according to claim 1 including the step of applying the composition only on discrete areas of the receiving surface.
Claim 18
Dependent Claim
59 words
A method according to claim 1, including repeating steps (b) and (c) to build up the thickness thereof on the receiving surface and in some but not all of said steps applying the composition only on discrete areas of the receiving surface to make the thickness of the composition in such areas thicker than elsewhere on said receiving surface.
Claim 19
Dependent Claim
30 words
A method according to claim 1, including the step of applying a protective layer over the distributed particles interactive layer after the drying of the liquid component of the composition.
Claim 20
Dependent Claim
21 words
A method according to claim 18, wherein the protective layer is applied a a liquid formulation over the particulate interactive layer.
Claim 21
Dependent Claim
14 words
A method according to claim 19, wherein the protective layer is applied by printing.
Claim 22
Dependent Claim
24 words
A method according to claim 20, wherein the printing of the protective layer is by gravure, roller coating, litho letter press or silk screening.
Claim 23
Dependent Claim
22 words
A method according to claim 19, wherein the protective layer is a heat curable varnish which is cured by heat after application.
Claim 24
Dependent Claim
37 words
A method according to claim 19, wherein the protective layer liquid formulation includes visually modifying particles so that when the protective layer is applied over the interactive layer, the interactive layer is obscured or modified in appearance.
Claim 25
Dependent Claim
14 words
A method according to claim 23, wherein the visually modifying particles are aluminium particles.
Claim 26
Dependent Claim
35 words
A method according to claim 24, wherein the protective layer formulation comprises: 100 parts by weight Dow Corning 7144 Silicone coating (SYL-OFF) 4 parts by weight 7048 coating (SYL-OFF) 10 parts by weight aluminium powder
Claim 27
Dependent Claim
23 words
A method according to claim 18, wherein the protective layer is a synthetic plastics material film which is laminated to the interactive layer.
Claim 28
Dependent Claim
27 words
A method according to claim 1 wherein the receiving surface is a temporary support for the interactive material and is transferred therefrom to a second support surface.
Claim 29
Dependent Claim
19 words
A method according to claim 27, wherein said second support surface comprises a sheet of cardboard or plastics material.
Claim 30
Dependent Claim
36 words
A method according to claim 28, wherein said sheet of cardboard or plastics material comprises or forms part of a receptacle which is for receiving foodstuff and which is suitable for placement in a microwave oven.
Claim 31
Dependent Claim
25 words
A method according to claim 27, wherein the interactive layer is transferred after drying of the liquid component and by a heat transfer laminating step.
Claim 32
Dependent Claim
25 words
A method according to claim 27, wherein the interactive layer after transfer to the second support surface, is covered by means of a protective layer.
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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) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |