US3743129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tear-off closure with reinforcing rib
Assignee: Alcoa Corp
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Filing: 1971-03-05
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Granted: 1973-07-03
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Expires: 1991-03-05
Abstract
Abstract A tear-off closure is provided which has a top end wall and a depending skirt and having a tear strip defined by scoring divisive of the end wall and into the skirt, the tear strip having at least one embossed rib therein which extends from a location toward the center of the closure radially outward to a location adjacent the shoulder of the closure between its end wall and the skirt to ensure severance of the tear strip over such shoulder of the closure. The closure may further have a raised rim around a recessed central panel in its top end wall, with the rib in the tear strip extending from the recessed central panel into the rim of the closure.
Inventors
- 👤 W Willis
- 👤 R Labarge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:45
CPC Classifications
B; B65; B65D; B65D51/00; B65D51/18; B65D41/00; B65D41/32; B65D41/40; B65D2251/00; B65D2251/0003; B65D2251/0006; B65D2251/0015; B65D2251/0068; B65D2251/0078
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
In a sheet metal closure having a top end wall and a depending skirt with a tear strip divisive of the top end wall and extending into the skirt, and further having a tab attached to the starting end of the tear strip, the improvement comprising at least one embossed rib in the tear strip extending from a central portion of the end wall outwardly at least to a chordal line drawn across the top of the closure through the intersections of the sides of the tear strip with the corner of the closure between its end wall and skirt to form a rigid section in the tear strip to resist bending thereof between the end wall and skirt of the closure whereby severance of the tear strip over the corner of the closure is facilitated.
Claim 2
Dependent Claim
136 words
In a sheet metal closure having a top end wall and a depending skirt with a tear strip divisive of the top end wall and extending into the skirt, and further having a tab attached to the starting end of the tear strip, the improvement comprising at least one embossed rib in the tear strip extending from a central portion of the end wall outwardly at least to a chordal line drawn across the top of the closure through the intersections of the sides of the tear strip with the corner of the closure between its end wall and skirt to form a rigid section in the tear strip to resist bending thereof between the end wall and skirt of the closure whereby severance of the tear strip over the corner of the closure is facilitated.
Claim 3
Dependent Claim
15 words
A closure as set forth in claim 1 in which said rib is upwardly embossed.
Claim 4
Dependent Claim
21 words
A closure as set forth in claim 1 which includes a curled bead on the bottom edge of the closure skirt.
Claim 5
Dependent Claim
45 words
A closure as set forth in claim 1 in which said tear strip is defined by a U-shaped score having one leg which extends to the bottom edge of the closure skirt and a second leg which terminates short of the bottom of the skirt.
Claim 6
Dependent Claim
30 words
A closure as set forth in claim 1 in which said top end wall is substantially flat and said rib is substantially equidistant between the sides of the tear strip.
Claim 7
Dependent Claim
24 words
A closure as set forth in claim 5 in which said top end wall includes a circular depression in which said tab is seated.
Claim 8
Dependent Claim
45 words
A closure as set forth in claim 1 in which said top end wall includes a recessed central panel with a raised rim therearound and the tear strip includes three upwardly embossed ribs extending from the recessed central panel into the rim of the closure.
Claim 9
Dependent Claim
48 words
A closure as set forth in claim 7 in which said ribs extend outwardly at least to a chordal line drawn across the top of the closure through the intersections of the sides of the tear strip with the corner of the closure between its rim and skirt.
Claim 10
Dependent Claim
51 words
A closure as set forth in claim 7 including a center rib which extends from a central portion of the closure into the rim and two shorter ribs, one on either side of said center rib and diverging from the center rib as they extend toward the periphery of the closure.
References Cited (Backward Citations)
US3556336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |