US4091930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Container
Assignee: Robert Bosch GmbH
•
Filing: 1977-02-15
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Granted: 1978-05-30
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Expires: 1997-02-15
Abstract
Abstract A container made from a foil or laminate material and provided with a cover which is sealed to a flange of the container by the application of heat. In order to facilitate removal of the cover, all or all but one of the corners of the container have cuts or kerfs extending from the outer edge up to the welded bead. To open the container, the tab defined by each kerf is grasped and pulled upwardly so that the adjacent strip of cover and flange is removed by tearing along one straight side of the polygonal container. The procedure is repeated at successive sides until all or all but one of the edge strips have been removed.
Inventors
- 👤 Norbert Buchner
- 👤 Werner Brose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:33
CPC Classifications
B; B65; B65D; B65D77/00; B65D77/22; B65D77/30; B65D77/10; B65D77/20; B65D77/2024; B65D77/2028; B65D77/2032; B65D77/2044; B65D77/2048; B65D77/2052; B65D2577/00; B65D2577/10; B65D2577/20; B65D2577/2025; B65D2577/2041; B65D2577/205; Y; Y10; Y10S; Y10S229/00; Y10S229/924
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
201 words
In a container which includes a dish having a base and an upstanding wall and which defines an open-ended interior volume, said wall defining an outstanding flange around the periphery of the open end of said dish, and a cover for closing the open end of said dish, said cover being sealable to said flange by the application of heat to form a continuous welded bead on an intermediate area of said flange when sealed, the improvement comprising: said dish and said cover have a periphery in the shape of a polygon and on at least each but one corner of said polygon, there is provided in said flange and said cover a kerf making an incision in said flange and said cover and extending from the periphery of said flange and said cover along one side of the corner to a point substantially adjacent to said bead, said kerf pointing in the direction of a zone lying between and jointly defined by the inner edge of said flange and said welded bead; whereby, when said corner is pulled away from said dish, said flange together with the overlying portion of said cover are separated from said dish along said zone.
Claim 2
Dependent Claim
201 words
In a container which includes a dish having a base and an upstanding wall and which defines an open-ended interior volume, said wall defining an outstanding flange around the periphery of the open end of said dish, and a cover for closing the open end of said dish, said cover being sealable to said flange by the application of heat to form a continuous welded bead on an intermediate area of said flange when sealed, the improvement comprising: said dish and said cover have a periphery in the shape of a polygon and on at least each but one corner of said polygon, there is provided in said flange and said cover a kerf making an incision in said flange and said cover and extending from the periphery of said flange and said cover along one side of the corner to a point substantially adjacent to said bead, said kerf pointing in the direction of a zone lying between and jointly defined by the inner edge of said flange and said welded bead; whereby, when said corner is pulled away from said dish, said flange together with the overlying portion of said cover are separated from said dish along said zone.
Claim 3
Dependent Claim
51 words
A container as defined by claim 1 wherein said kerfs are so located that an arrow so placed as to point from the open end to the closed end of each kerf defines the same sense of rotation with respect to the center of said container for all of said kerfs.
Claim 4
Dependent Claim
17 words
A container as defined by claim 2, wherein the corner portions of said welded bead are rounded.
Claim 5
Dependent Claim
18 words
A container as defined by claim 1, wherein said kerfs extend into a portion of said welded bead.
Claim 6
Dependent Claim
20 words
A container as defined by claim 1 wherein said kerf is a single cut incising said cover and said flange.
Claim 7
Dependent Claim
20 words
A container as defined by claim 1, wherein said dish and said cover are made from a metal-plastic laminate material.
References Cited (Backward Citations)
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US2161093A
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US2791324A
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US3049224A
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US3338400A
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Cited
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Cited
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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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |