§
PatentCue
Patent Intelligence
Join Waitlist Sign In
← Back to Patent Explorer
EP0312333A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Microwave absorbing composite

Assignee: 3M Co
•
Filing: 1988-10-12
•
Granted: —
•
Expires: 2008-10-12
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract This invention relates to articles that are capable of absorbing microwave energy and converting same to heat energy. This invention provides a microwave absorbing composite (10) comprising at least two zones (12, 14) of material capable of absorbing microwave energy, each set of said two zones being separated by one zone (16) of material transparent to or transmissive of microwave energy. The microwave energy absorbing zones are selected such that the composite is incapable of arcing in a microwave oven whereof the maximum power output does not exceed 2000 watts at a frequency of 2.45 GHz. The major advantage of the composite of this invention is that the composite can absorb significantly more microwave energy from such sources as a microwave oven without undergoing arcing than can a susceptor having only a single microwave absorbing zone. The composite can there­fore develop heat at a faster rate, without arcing, when employed as a microwave susceptor than can a susceptor having only a single microwave absorbing zone. The composite of this invention can be used for such purposes as crisping, browning, or otherwise heating food products, as a material for packaging, or as a package venting material.

Inventors

  • 👤 Jeffrey O. C/O Minnesota Mining And Emslander
  • 👤 Curtis L. C/O Minnesota Mining And Larson
  • 👤 Pierre H. C/O Minnesota Mining And Lepere

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-01 00:14
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/36; B32B29/00; B32B29/002; B32B29/005; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B32B2255/00; B32B2255/10; B32B2255/12; B32B2255/20; B32B2255/205; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3439; B65D2581/3452; B65D2581/3463; B65D2581/3466; B65D2581/3471; B65D2581/3472; B65D2581/3474; B65D2581/3477; B65D2581/3478; B65D2581/3479; B65D2581/3486; B65D2581/3487

Claims Analysis

Total Claims: 19
Claim 1
Independent Claim 63 words
A microwave absorbing composite comprising at least two zones of material capable of absorbing microwave energy, each pair of said microwave energy absorbing zones being separated by a zone of material transparent to microwave energy, provided that said composite is incapable of arcing in a microwave oven whereof the maximum power output does not exceed 2000 watts at a frequency of 2.45 GHz.
Claim 2
Dependent Claim 63 words
A microwave absorbing composite comprising at least two zones of material capable of absorbing microwave energy, each pair of said microwave energy absorbing zones being separated by a zone of material transparent to microwave energy, provided that said composite is incapable of arcing in a microwave oven whereof the maximum power output does not exceed 2000 watts at a frequency of 2.45 GHz.
Claim 3
Dependent Claim 23 words
The composite of claim 1 including a layer of adhesive applied to at least one major surface of at least one zone thereof.
Claim 4
Dependent Claim 12 words
The composite of claim 2 wherein said adhesive is a pressure-sensitive adhesive.
Claim 5
Dependent Claim 12 words
The composite of claim 2 wherein said adhesive is a silicone-based adhesive.
Claim 6
Dependent Claim 12 words
The composite of claim 2 wherein said adhesive is an acrylic-based adhesive.
Claim 7
Dependent Claim 23 words
The composite of claim 1 wherein at least one zone of said material capable of absorbing microwave energy comprises an electrically conductive material.
Claim 8
Dependent Claim 13 words
The composite of claim 6 wherein said electrically conductive material comprises a metal.
Claim 9
Dependent Claim 13 words
The composite of claim 7 wherein said metal is a vacuum deposited metal.
Claim 10
Dependent Claim 14 words
The composite of claim 6 wherein said electrically conductive material comprises a metal oxide.
Claim 11
Dependent Claim 20 words
The composite of claim 6 wherein said electrically conductive material comprises a dispersion of electrically conductive materials in a binder.
Claim 12
Dependent Claim 19 words
The composite of claim 1 wherein said zone of material transparent to microwave energy comprises an electrically insulative material.
Claim 13
Dependent Claim 13 words
The composite of claim 11 wherein said electrically insulative material comprises a polymer.
Claim 14
Dependent Claim 17 words
The composite of claim 12 wherein said polymer is in the form of an extruded polymeric film.
Claim 15
Dependent Claim 16 words
The composite of claim 1 wherein said zone of material transparent to microwave energy comprises paper.
Claim 16
Dependent Claim 19 words
The composite of claim 1 wherein there are up to ten zones of material capable of absorbing microwave energy.
Claim 17
Dependent Claim 10 words
A package having applied thereto the composite of claim 1.
Claim 18
Dependent Claim 17 words
The package of claim 16 wherein said composite is applied over a thermoplastic portion of said package.
Claim 19
Dependent Claim 17 words
The package of claim 16 wherein said composite is applied over a perforated portion of said package.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag