Patent US4219573A successfully refreshed from Google Patents.
US4219573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave popcorn package
Assignee: Pillsbury Co
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Filing: 1979-02-26
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Granted: 1980-08-26
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Expires: 1999-02-26
Abstract
Abstract A package for popping popcorn in a microwave oven is provided. The package includes an expandable container adapted to contain popcorn, oil and salt which when exposed to microwave radiation, the oil and popcorn will become heated and the popcorn will pop (steam produced by the heating will expand the container to accommodate the popped popcorn). The container has one wall with a thermal insulating pad associated therewith which improves the popping performance of the popcorn by preventing heat loss from the package to the oven floor.
Inventors
- 👤 James R. Borek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:11
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B65D81/3461; B65D81/3469; A; A23; A23L; A23L7/00; A23L7/10; A23L7/161; A23L7/174; A23L7/183; A47; A47J; A47J36/00; A47J36/02; A47J36/022; B65D2581/00; B65D2581/34; B65D2581/3401; B65D2581/3402; B65D2581/3421
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
201 words
An improved expandable popcorn container for use in microwave ovens with the containers being adapted to store popcorn, oil and salt before popping and being adapted to contain the popcorn, oil and salt during exposure to microwave radiation to effect the popping of the popcorn, said container being microwave transparent and having popcorn, oil and salt therein and being sealed whereby vapor produced during heating expands the internal volume of the container to allow room for popping of the popcorn, said container having one wall adapted to rest on the floor of the oven and be disposed between the popcorn and floor of a microwave oven, wherein the improvement comprises: said container also including a layer of thermal insulating material associated with the wall in a manner such that the material will be disposed between the popcorn and oven floor during exposure of the container and popcorn to microwave radiation, said material having a thermal conductivity of less than about 0.001 calories/cm 2 °C./cm, a density of less than about 0.4 gm/cm 3 and a thickness of less than about 3/8" sufficient to prevent the loss of at least about 18 calories per gram of popcorn in the container during popping.
Claim 2
Dependent Claim
201 words
An improved expandable popcorn container for use in microwave ovens with the containers being adapted to store popcorn, oil and salt before popping and being adapted to contain the popcorn, oil and salt during exposure to microwave radiation to effect the popping of the popcorn, said container being microwave transparent and having popcorn, oil and salt therein and being sealed whereby vapor produced during heating expands the internal volume of the container to allow room for popping of the popcorn, said container having one wall adapted to rest on the floor of the oven and be disposed between the popcorn and floor of a microwave oven, wherein the improvement comprises: said container also including a layer of thermal insulating material associated with the wall in a manner such that the material will be disposed between the popcorn and oven floor during exposure of the container and popcorn to microwave radiation, said material having a thermal conductivity of less than about 0.001 calories/cm 2 °C./cm, a density of less than about 0.4 gm/cm 3 and a thickness of less than about 3/8" sufficient to prevent the loss of at least about 18 calories per gram of popcorn in the container during popping.
Claim 3
Dependent Claim
38 words
A container as set forth in claim 1 wherein the thermal insulating properties of the material are such as to prevent the loss of at least about 21 calories per gram of popcorn during popping of the popcorn.
Claim 4
Dependent Claim
33 words
A container as set forth in claim 2 wherein the material has sufficient thermal insulating properties to prevent the loss of at least about 24 calories per gram of popcorn in the container.
Claim 5
Dependent Claim
36 words
A container as set forth in claim 3 wherein the material has thermal insulating properties sufficient to prevent the loss of at least about 27 calories per gram of popcorn contained in the container during popping.
Claim 6
Dependent Claim
44 words
A container as set forth in claim 1, 2, 3, or 4 wherein the thermal conductivity of the material is less than about 0.0005 calories/cm 2 °C./cm, a density of less than about 0.2 gm/cm 3 and a thickness of less than about 1/4".
Claim 7
Dependent Claim
37 words
A container as set forth in claim 5 wherein the thermal conductivity of the material is less than about 0.00025 a density of less than about 0.1 gm/cm 3 and a thickness of less than about 1/8".
Claim 8
Dependent Claim
20 words
A container as set forth in claim 6 wherein the material is secured to an exterior surface of the wall.
Claim 9
Dependent Claim
17 words
A container as set forth in claim 7 including indicia on an exposed surface of the material.
Claim 10
Dependent Claim
14 words
A container as set forth in claim 1 wherein said material includes corrugated paper.
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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) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |