US3924013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cooking food in a polythylene terephthalate/paperboard laminated container
Assignee: EIDP Inc
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Filing: 1972-08-18
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Granted: 1975-12-02
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Expires: 1992-08-18
Abstract
Abstract A container is provided formed from a blank made of a laminate which includes nonbrowning paperboard and at least an inner layer of substantially amorphous polyethylene terephthalate bonded to the paperboard by its own substance. A method of making this laminate is provided including the steps of heating an uncoated surface or both surfaces of the paperboard to a temperature of at least about 285*F. and extruding the polyethylene terephthalate layer onto this surface or these surfaces. A method of cooking is provided including the steps of forming a container from the blank, placing food in the container and cooking the food at a temperature of up to about 400*F.
Inventors
- 👤 William Paul Kane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:36
CPC Classifications
A; A21; A21B; A21B3/00; A21B3/13; A21B3/131; B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; A47; A47J; A47J36/00; A47J36/02; A47J36/022; B29; B29C; B29C48/00; B32B27/36; B32B38/00; B32B38/0036; B65; B65D; B65D5/00; B65D5/20; B65D5/24; B65D5/248; D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/24; D21H19/28; B29C48/03; B29C48/07; B29C48/08; B32B2307/00; B32B2307/70; B32B2307/702; B32B2309/00; B32B2309/02; B32B2367/00; B32B2439/00; B32B2439/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/3179
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
A METHOD OF COOKING FOOD INCLUDING THE STEPS OF PROVIDING A CONTAINER FORMED FROM A BLANK FORMED FROM A LAMINATE INCLUDIDNG PAPERBOARD HAVING A LAYER OF SUBSTANTIALLY AMORPHOUS POLYETHYLENE TEREPHTHALATE EXTRUDED ONTO AN UNCOATED SURFACE THEREOF AND WHEREIN SUCH SURFACE IS HEATED TO A TEMPERATURE OF AT LEAST ABOUT 285*F. PRIOR TO SUCH EXTRUSION, SAID PAPERBOARD CAPABLE OF BEING HEATED TO A COOKING TEMPERATURE OF UP TO ABOUT 400*F WITHOUT BROWNING, AND SIAD CONTAINER BEING FORMED BY FOLDING THE BLANK TO BRING SURFACE PORTIONS OF THE AMORPHOUS POLYETHYLENE TEREPHTHALATE LAYER THEREOF INTO ABUTTING CONTACTING WITH OTHER SURFACE PORTIONS OF SUCH LAYER AND BY HEATING-SEALING THESE ABUTTING SURFACE PORTIONS TOGETHER; PLACING FOOD IN SAID CONTAINER IN CONTACT WITH SAID LAYER OF POLYETHYLENE TEREPHTHALATE; AND COOKING THE FOOD IN SAID CONTAINER AT A TEMPERATURE OF UP TO ABOUT 400*F.
Claim 2
Independent Claim
137 words
A METHOD OF COOKING FOOD INCLUDING THE STEPS OF PROVIDING A CONTAINER FORMED FROM A BLANK FORMED FROM A LAMINATE INCLUDIDNG PAPERBOARD HAVING A LAYER OF SUBSTANTIALLY AMORPHOUS POLYETHYLENE TEREPHTHALATE EXTRUDED ONTO AN UNCOATED SURFACE THEREOF AND WHEREIN SUCH SURFACE IS HEATED TO A TEMPERATURE OF AT LEAST ABOUT 285*F. PRIOR TO SUCH EXTRUSION, SAID PAPERBOARD CAPABLE OF BEING HEATED TO A COOKING TEMPERATURE OF UP TO ABOUT 400*F WITHOUT BROWNING, AND SIAD CONTAINER BEING FORMED BY FOLDING THE BLANK TO BRING SURFACE PORTIONS OF THE AMORPHOUS POLYETHYLENE TEREPHTHALATE LAYER THEREOF INTO ABUTTING CONTACTING WITH OTHER SURFACE PORTIONS OF SUCH LAYER AND BY HEATING-SEALING THESE ABUTTING SURFACE PORTIONS TOGETHER; PLACING FOOD IN SAID CONTAINER IN CONTACT WITH SAID LAYER OF POLYETHYLENE TEREPHTHALATE; AND COOKING THE FOOD IN SAID CONTAINER AT A TEMPERATURE OF UP TO ABOUT 400*F.
Claim 3
Independent Claim
137 words
A method of cooking food including the steps of: providing a container formed from a blank formed froM a laminate including paperboard having a layer of substantially amorphous polyethylene terephthalate extruded onto an uncoated surface thereof and wherein such surface is heated to a temperature of at least about 285*F. prior to such extrusion, said paperboard capable of being heated to a cooking temperature up to about 400*F without browning, and said container being formed by folding the blank to bring surface portions of the amorphous polyethylene terephthalate layer thereof into abutting contact with portions of the other surface of the paperboard and by heat-sealing these surface portions together; placing food in said container in contact with said layer of polyethylene terephthalate; and cooking the food in said container at a temperature of up to about 400*F.
Claim 4
Independent Claim
137 words
A method of cooking food including the steps of: providing a container formed from a blank formed froM a laminate including paperboard having a layer of substantially amorphous polyethylene terephthalate extruded onto an uncoated surface thereof and wherein such surface is heated to a temperature of at least about 285*F. prior to such extrusion, said paperboard capable of being heated to a cooking temperature up to about 400*F without browning, and said container being formed by folding the blank to bring surface portions of the amorphous polyethylene terephthalate layer thereof into abutting contact with portions of the other surface of the paperboard and by heat-sealing these surface portions together; placing food in said container in contact with said layer of polyethylene terephthalate; and cooking the food in said container at a temperature of up to about 400*F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |