Patent US3967749A successfully refreshed from Google Patents.
US3967749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Easy opening end closure for a container and method of making the same
Assignee: Continental Can Co Inc
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Filing: 1973-05-29
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Granted: 1976-07-06
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Expires: 1993-05-29
Abstract
Abstract The easy opening end closure for attachment to a can body. The end closure includes a plastic pull tab having a closure tab sealed in a slit which defines a displacable closure. The pull tab is attached by forging a plastic strip over a lid in a manner such that the plastic is caused to flow and force the metal panel against a cutting edge to form a slit defining a displacable closure. At the same time the forged plastic flows beneath the adjacent edges of the slit to form a tight seal therein.
Inventors
- 👤 John Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:57
CPC Classifications
B; B65; B65D; B65D17/00; B65D17/50; B65D17/506; B65D17/507; B65D17/508
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
An easy opening end closure for a container, said end closure comprising a metal panel, a slit in said panel, said slit defining a separable closure in said panel, a plastic tab completely overlying said separable closure and including a closure portion seated in said slit, said closure portion including a displaced portion having the appearance of being seated in said slit by the forging and displacement of the plastic material of said tab and said panel has a depending displaced edge in the form of a downwardly depending lip adjacent said slit, said forged plastic underlying both a marginal edge portion of the panel surrounding said separable closure along one side of the slit and the separable closure on the other side of the slit with said forged plastic being interlocked with said displaced edge and resisting outward movement of said separable closure.
Claim 2
Dependent Claim
144 words
An easy opening end closure for a container, said end closure comprising a metal panel, a slit in said panel, said slit defining a separable closure in said panel, a plastic tab completely overlying said separable closure and including a closure portion seated in said slit, said closure portion including a displaced portion having the appearance of being seated in said slit by the forging and displacement of the plastic material of said tab and said panel has a depending displaced edge in the form of a downwardly depending lip adjacent said slit, said forged plastic underlying both a marginal edge portion of the panel surrounding said separable closure along one side of the slit and the separable closure on the other side of the slit with said forged plastic being interlocked with said displaced edge and resisting outward movement of said separable closure.
Claim 3
Dependent Claim
18 words
The easy opening end closure as defined in claim 1 wherein said downwardly depending lip is reversely curved.
Claim 4
Dependent Claim
28 words
The easy opening end closure as defined in claim 2 wherein said tab is a pull tab and includes a finger grip portion extending from said closure portion.
Claim 5
Dependent Claim
27 words
The invention as defined in claim 1, wherein said slit defining said separable closure is a continuous slit with said separable closure being removable from said panel.
Claim 6
Dependent Claim
36 words
The invention as defined in claim 1, wherein said slit is discontinuous to provide an unslit portion about which said separable closure is hingeable for depression into a container upon the application of a pushing force.
Claim 7
Dependent Claim
28 words
The invention as defined in claim 5 wherein said tab is forged into said panel to form a pop disk defined by a slit intersecting said closure portion.
Claim 8
Dependent Claim
39 words
The invention as defined in claim 6 wherein said closure portion is a disk and wherein means mount said pop disk for hinging relative to said closure portion at the intersection of said pop disk with said closure portion.
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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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |