US4507338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Container comprising a polysulfone resin layer with a cellular resin core
Assignee: EDONE JOHN M
•
Filing: 1983-06-30
•
Granted: 1985-03-26
•
Expires: 2003-06-30
Abstract
Abstract This invention relates to the use of two or more polymeric materials combined together forming a composite, layered structure for use in microwave oven cookware or similar types of application.
Inventors
- 👤 Richard A. Freundlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:57
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/065; B32B27/28; B32B1/00; B32B27/08; B32B27/286; B32B27/30; B32B27/302; B32B5/00; B32B5/18; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0221; B32B2266/0228; B32B2305/00; B32B2305/02; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2439/00; B32B2439/02; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1376; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/31504; Y10T428/31533
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
A container for food products transparent to microwaves for use in a microwave oven having a cellular inner core of about 0.25 to about 1.0 inch in thickness composed of a resin having a softening point of over about 100° C., and a thin, non-foamed outer covering of from about 0.0005 to about 0.040 inch in thickness, of an amorphous, thermoplastic polysulfone resin.
Claim 2
Dependent Claim
63 words
A container for food products transparent to microwaves for use in a microwave oven having a cellular inner core of about 0.25 to about 1.0 inch in thickness composed of a resin having a softening point of over about 100° C., and a thin, non-foamed outer covering of from about 0.0005 to about 0.040 inch in thickness, of an amorphous, thermoplastic polysulfone resin.
Claim 3
Dependent Claim
17 words
The container of claim 1 wherein said cellular resin is a copolymer of styrene and maleic anhydride.
Claim 4
Dependent Claim
20 words
The container of claim 1 wherein said inner core material is a copolymer of styrene and about 18% maleic anhydride.
Claim 5
Dependent Claim
49 words
The container of claim 1 wherein said outer layer has a thickness of from about 0.0005 to about 0.040 inch, and said inner core has a thickness of from about 0.25 to about 1.0 inch and a density of from about 10 to about 30 pounds per cubic foot.
Claim 6
Dependent Claim
47 words
The container of claim 1 wherein said outer layer has a thickness of about 0.001 to about 0.002 inch, and said inner core has a thickness of about 0.25 to about 1.0 inch and a density of from about 10 to about 30 pounds per cubic foot.
Claim 7
Dependent Claim
18 words
The container of claim 1 wherein the outer sheet and inner sheet are bonded together by a solvent.
Claim 8
Dependent Claim
20 words
The container of claim 1 wherein the outer sheet and inner sheet are bonded together by the application of tetrahydrofuran.
Claim 9
Dependent Claim
23 words
The container of claim 1 wherein the inner and outer sheets are bonded together by heat sealing of the surface of each sheet.
Claim 10
Dependent Claim
20 words
The container of claim 1 wherein the composite sheet is formed by extrusion of the core layer and outer layer.
References Cited (Backward Citations)
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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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |