Patent US3904104A successfully refreshed from Google Patents.
US3904104A
Expired / Lapsed
US
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Polyethylene terephthalate/paperboard blank and container formed from such blank
Assignee: EIDP Inc
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Filing: 1974-05-09
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Granted: 1975-09-09
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Expires: 1994-05-09
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
2026-10-30 19:09
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/20; B65D5/24; B65D5/248; B32; B32B; B32B27/00; D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/24; D21H19/28; Y; Y10; Y10S; Y10S229/00; Y10S229/902; Y10S229/903; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/3179
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
A container blank having parts including a bottom part with body parts connected thereto, such blank being formed of a laminate including a nonbrowning paperboard having at least an extruded layer of substantially amorphous polyethylene terephthalate bonded thereto, such layer being extruded onto an uncoated surface of the paperboard after such surface has been heated to a temperature of at least 285*F., such blank being capable of being folded to bring surface portions of such amorphous polyethylene terephthalate layer thereof into abutting contact with other surface portions of such blank and the container being formed by heAt-sealing these abutting surface portions together, and such container being capable of being heated to a temperature of up to about 400*F.
Claim 2
Dependent Claim
118 words
A container blank having parts including a bottom part with body parts connected thereto, such blank being formed of a laminate including a nonbrowning paperboard having at least an extruded layer of substantially amorphous polyethylene terephthalate bonded thereto, such layer being extruded onto an uncoated surface of the paperboard after such surface has been heated to a temperature of at least 285*F., such blank being capable of being folded to bring surface portions of such amorphous polyethylene terephthalate layer thereof into abutting contact with other surface portions of such blank and the container being formed by heAt-sealing these abutting surface portions together, and such container being capable of being heated to a temperature of up to about 400*F.
Claim 3
Dependent Claim
132 words
A container for baking and cooking which comprises: a substantially flat bottom part and body parts connected thereto; the container being formed from a blank formed of a laminate comprising a layer of non-browning paperboard and at least a layer of substantially amorphous polyethylene terephthalate bonded to the paperboard layer by its own substance; such layer being extruded onto an uncoated surface of the paperboard after such surface has been heated to a temperature of at least 285*F.; the container having abutting surface portions of the body parts secured together wherein at least one of each of such abutting surface portions is of the polyethylene terephthalate layer and wherein such abutting surface portions are heat-sealed together and such container being capable of being heated to a temperature of up to about 400*F.
Claim 4
Dependent Claim
132 words
A container for baking and cooking which comprises: a substantially flat bottom part and body parts connected thereto; the container being formed from a blank formed of a laminate comprising a layer of non-browning paperboard and at least a layer of substantially amorphous polyethylene terephthalate bonded to the paperboard layer by its own substance; such layer being extruded onto an uncoated surface of the paperboard after such surface has been heated to a temperature of at least 285*F.; the container having abutting surface portions of the body parts secured together wherein at least one of each of such abutting surface portions is of the polyethylene terephthalate layer and wherein such abutting surface portions are heat-sealed together and such container being capable of being heated to a temperature of up to about 400*F.
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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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |