US4740377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for microwave cooking of foods
Assignee: DuPont Canada Inc
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Filing: 1986-12-23
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Granted: 1988-04-26
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Expires: 2006-12-23
Abstract
Abstract The present invention provides a method for heating food comprising heating in a microwave oven for at least 2 minutes a food package which comprises food placed in an injection moulded food container, made from a partially crystalline polyamide, optionally containing a compatibilized olefin-based polymer and/or a filler. The food container has wall and floor thicknesses of 1.6 mm or less.
Inventors
- 👤 David H. Dawes
- 👤 Eldon L. Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:08
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; A; A23; A23L; A23L5/00; A23L5/10; A23L5/15; B29; B29D; B29D30/00; B29D30/06; B29D30/08; B29D30/20; B29D30/30; B29D30/3007; B29D30/24; B29D30/26; B29D2030/2642
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
63 words
A method for heating food comprising heating in a microwave oven for at least 2 minutes a food package which comprises said food placed in an injection moulded food container which has been made from a partially crystalline polyamide and has a floor and walls attached thereto, said floor and walls having substantially the same thickness, said thickness being up to 1.6 mm.
Claim 2
Independent Claim
63 words
A method for heating food comprising heating in a microwave oven for at least 2 minutes a food package which comprises said food placed in an injection moulded food container which has been made from a partially crystalline polyamide and has a floor and walls attached thereto, said floor and walls having substantially the same thickness, said thickness being up to 1.6 mm.
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein the crystalline polyamide is nylon 6 or nylon 66.
Claim 4
Dependent Claim
27 words
A method according to claim 2 wherein the partially crystalline polyamide contains a filler in an amount of 1 to 40 wt % of the filled polyamide.
Claim 5
Dependent Claim
38 words
A method according to claim 2 wherein the container has been made from a blend of a partially crystalline polyamide and a compatibilized olefin-based polymer in an amount of from 1 to 30 wt % of the blend.
Claim 6
Dependent Claim
38 words
A method according to claim 4 wherein the compatibilized olefin-based polymer is selected from (i) copolymers of ethylene and unsaturated carboxylic acid or unsaturated ester monomers, and (ii) hydrocarbon alpha-olefins grafted with unsaturated carboxylic acids or unsaturated anhydrides.
Claim 7
Dependent Claim
80 words
A method according to claim 5 wherein the compatibilized olefin-based polymer is selected from ethylene/vinyl acetate copolymers, ethylene/methylacrylate copolymers, ethylene/ethalacrylate copolymers, ethylene/n-butylacrylate copolymers, ethylene/methacrylate copolymers, ethylene/methacrylic acid copolymers, partially neutralized ethylene/methacrylic acid copolymers, ethylene/acrylate ester copolymers grafted with unsaturated carboxylic acids or unsaturated anhydrides, ethylene/vinyl acetate copolymers grafted with unsaturated carboxylic acids or unsaturated anhydrides, ethylene/C 4 to C 10 alpha-olefin copolymers grafted with unsaturated carboxylic acids or unsaturated anhydrides, and ethleyne homopolymers grafted with unsaturated carboxylic acids or anhydrides.
Claim 8
Dependent Claim
22 words
A method according to claim 6 wherein the compatibilized olefin-based polymer is in an amount of 10-20 wt % of the blend.
Claim 9
Dependent Claim
55 words
A method according to claim 2 wherein the container has been made from a blend of a partially crystalline polyamide and a compatibilized olefin-based polymer in an amount of from 1 to 30 wt % of the blend, and additionally containing a filler in an amount of 1 to 40 wt % of the blend.
Claim 10
Dependent Claim
21 words
A method according to claim 1 wherein the crystalline polyamide is nylon 66 having an RV of from 25 to 250.
Claim 11
Dependent Claim
27 words
A method according to claim 9 wherein the partially crystalline polyamide contains a filler in an amount of 1 to 40 wt % of the filled polyamide.
Claim 12
Dependent Claim
38 words
A method according to claim 9 wherein the container has been made from a blend of a partially crystalline polyamide and a compatibilized olefin-based polymer in an amount of from 1 to 30 wt % of the blend.
Claim 13
Dependent Claim
38 words
A method according to claim 11 wherein the compatibilized olefin-based polymer is selected from (i) copolymers of ethylene and unsaturated carboxylic acid or unsaturated ester monomers, and (ii) hydrocarbon alpha-olefins grafted with unsaturated carboxylic acids or unsaturated anhydrides.
Claim 14
Dependent Claim
81 words
A method according to claim 12 wherein the compatibilized olefin-based polymer is selected from ethylene/vinyl acetate copolymers, ethylene/methylacrylate copolymers, ethylene/ethylacrylate copolymers, ethylene/n-butylacrylate copolymers, ethylene/methacrylate copolymers, ethylene/methacrylic acid copolymers, partially neutralized ethylene/methacrylic acid copolymers, ethylene/acrylate ester copolymers grafted with unsaturated carboxylic acids or unsaturated anhydrides, ethylene/vinyl acetate copolymers grafted with unsaturated carboxylic acids or unsaturated anhydrides, ethylene/C 4 to C 10 alpha-olefin copolymers grafted with unsaturated carboxylic acids or unsaturated anhydrides, and ethylene homopolymers grafted with unsaturated carboxylic acids or unsaturated anhydrides.
Claim 15
Dependent Claim
22 words
A method according to claim 13 wherein the compatibilized olefin-based polymer is in an amount of 10-20 wt % of the blend.
Claim 16
Dependent Claim
55 words
A method according to claim 9 wherein the container has been made from a blend of a partially crystalline polyamide and a compatibilized olefin-based polymer in an amount of from 1 to 30 wt % of the blend, and additionally containing a filler in an amount of 1 to 40 wt % of the blend.
Claim 17
Dependent Claim
25 words
A method according to claim 1 wherein the partially crystalline polyamide contains a filler in an amount of 40 wt % of the filled polyamide.
Claim 18
Dependent Claim
21 words
A method according to claim 16, 5 or 6 wherein the filler is an amount of 10 to 30 wt %.
Claim 19
Dependent Claim
25 words
A method according to claim 16, 3 or 10 wherein the filler is talc or mica in an amount of 10 to 40 wt %.
Claim 20
Dependent Claim
38 words
A method according to claim 1 wherein the container has been made from a blend of a partially crystalline polyamide and a compatibilized olefin-based polymer in an amount of from 1 to 30 wt % of the blend.
Claim 21
Dependent Claim
38 words
A method according to claim 19 wherein the compatibilized olefin-based polymer is selected from (i) copolymers of ethylene and unsaturated carboxylic acid or unsaturated ester monomers, and (ii) hydrocarbon alpha-olefins grafted with unsaturated carboxylic acids or unsaturated anhydrides.
Claim 22
Dependent Claim
81 words
A method according to claim 20 wherein the compatibilized olefin-based polymer is selected from ethylene/vinyl acetate copolymers, ethylene/methylacrylate copolymers, ethylene/ethylacrylate copolymers, ethylene/n-butylacrylate copolymers, ethylene/methacrylate copolymers, ethylene/methacrylic acid copolymers, partially neutralized ethylene/methacrylic acid copolymers, ethylene/acrylate ester copolymers grafted with unsaturated carboxylic acids or unsaturated anhydrides, ethylene/vinyl acetate copolymers grafted with unsaturated carboxylic acids or unsaturated anhydrides, ethylene/C 4 to C 10 alpha-olefin copolymers grafted with unsaturated carboxylic acids or unsaturated anhydrides, and ethylene homopolymers grafted with unsaturated carboxylic acids or unsaturated anhydrides.
Claim 23
Dependent Claim
22 words
A method according to claim 21 wherein the compatibilized olefin-based polymer is in an amount of 10-20 wt % of the blend.
Claim 24
Dependent Claim
55 words
A method according to claim 1 wherein the container has been made from a blend of a partially crystalline polyamide and a compatibilized olefin-based polymer in an amount of from 1 to 30 wt % of the blend, and additionally containing a filler in an amount of 1 to 40 wt % of the blend.
Claim 25
Dependent Claim
22 words
A method according to claim 23, 8 or 15 wherein the filler is in an amount of 10 to 30 wt %.
Claim 26
Independent Claim
25 words
A method according to claims 23, 8 or 15 wherein the filler is mica or talc in an amount of 10 to 40 wt. %.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
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