Patent US3715052A successfully refreshed from Google Patents.
US3715052A
Expired / Lapsed
US
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Full panel self-opening end closure
Assignee: Primerica Inc
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Filing: 1971-11-08
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Granted: 1973-02-06
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Expires: 1991-11-08
Abstract
Abstract A self-opening end closure made of a steel basis sheet metal has both a rupturable score and a shallower non-rupturable score formed in the interior surface of a generally flat central end panel of the end closure. The rupturable score is formed near the periphery of the central panel to define a large removable portion within the central panel, and the non-rupturable score is disposed closely adjacent to but radially inwardly of the rupturable score. This combination of scores and their placement in the interior surface of the central end panel make possible the commercial manufacture, within realistic manufacturing tolerance, of a self-opening steel end closure having acceptable score integrity and openability characteristics.
Inventors
- 👤 C Kinkel
- 👤 T Phalin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:29
CPC Classifications
B; B65; B65D; B65D17/00; B65D17/28; B65D17/404
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
164 words
In a full panel, self-opening end closure made of a steel basis sheet metal and capable of being fabricated on a mass production basis which includes a high speed scoring operation wherein the depth of scoring may vary within the limits of approximately plus or minus 0.0005 inch from the desired scoring depth, the combination comprising: a rupturable score formed in the interior surface of a central end panel of the end closure adjacent to, and radially inwardly from, the periphery of said end panel to define a removable portion within said end panel, said rupturable score having a generally trapezoidal cross-sectional profile; and a non-rupturable score formed in the interior surface of said central end panel adjacent to the periphery of said removable portion radially inwardly from, and substantially concentric with said rupturable score, said nonrupturable score having a generally trapezoidal cross-sectional profile, the thickness of the residual steel metal of said non-rupturable score being substantially greater than that of said rupturable score.
Claim 2
Dependent Claim
164 words
In a full panel, self-opening end closure made of a steel basis sheet metal and capable of being fabricated on a mass production basis which includes a high speed scoring operation wherein the depth of scoring may vary within the limits of approximately plus or minus 0.0005 inch from the desired scoring depth, the combination comprising: a rupturable score formed in the interior surface of a central end panel of the end closure adjacent to, and radially inwardly from, the periphery of said end panel to define a removable portion within said end panel, said rupturable score having a generally trapezoidal cross-sectional profile; and a non-rupturable score formed in the interior surface of said central end panel adjacent to the periphery of said removable portion radially inwardly from, and substantially concentric with said rupturable score, said nonrupturable score having a generally trapezoidal cross-sectional profile, the thickness of the residual steel metal of said non-rupturable score being substantially greater than that of said rupturable score.
Claim 3
Dependent Claim
164 words
In a full panel, self-opening end closure made of a steel basis sheet metal and capable of being fabricated on a mass production basis which includes a high speed scoring operation wherein the depth of scoring may vary within the limits of approximately plus or minus 0.0005 inch from the desired scoring depth, the combination comprising: a rupturable score formed in the interior surface of a central end panel of the end closure adjacent to, and radially inwardly from, the periphery of said end panel to define a removable portion within said end panel, said rupturable score having a generally trapezoidal cross-sectional profile; and a non-rupturable score formed in the interior surface of said central end panel adjacent to the periphery of said removable portion radially inwardly from, and substantially concentric with said rupturable score, said nonrupturable score having a generally trapezoidal cross-sectional profile, the thickness of the residual steel metal of said non-rupturable score being substantially greater than that of said rupturable score.
Claim 4
Dependent Claim
164 words
In a full panel, self-opening end closure made of a steel basis sheet metal and capable of being fabricated on a mass production basis which includes a high speed scoring operation wherein the depth of scoring may vary within the limits of approximately plus or minus 0.0005 inch from the desired scoring depth, the combination comprising: a rupturable score formed in the interior surface of a central end panel of the end closure adjacent to, and radially inwardly from, the periphery of said end panel to define a removable portion within said end panel, said rupturable score having a generally trapezoidal cross-sectional profile; and a non-rupturable score formed in the interior surface of said central end panel adjacent to the periphery of said removable portion radially inwardly from, and substantially concentric with said rupturable score, said nonrupturable score having a generally trapezoidal cross-sectional profile, the thickness of the residual steel metal of said non-rupturable score being substantially greater than that of said rupturable score.
Claim 5
Dependent Claim
50 words
In a full panel, self-opening end closure, the combination according to claim 1, wherein the thickness of the residual steel metal of said rupturable score ranges from approximately 0.0019 to 0.0036 inch, which permits satisfactory performance of the steel end closure from the standpoint of score residual integrity and openability.
Claim 6
Dependent Claim
51 words
In a full panel, self-opening end closure, the combination according to claim 1, wherein the thickness of the residual steel metal of said rupturable score preferably ranges from approximately 0.0024 to 0.0036 inch, which permits satisfactory performance of the steel end closure from the standpoint of score residual integrity and openability.
Claim 7
Dependent Claim
48 words
In a full panel, self-opening end closure, the combination according to claim 1, wherein the thickness of the residual steel metal of said rupturable score is preferably approximately 0.0030 inch, which permits satisfactory performance of the steel end closure from the standpoint of score residual integrity and openability.
Claim 8
Dependent Claim
24 words
In a full panel, self-opening end closure, the combination according to claim 1, wherein the end closure is made from tin-plated steel sheet metal.
References Cited (Backward Citations)
US3501046A
Cited
US3576272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |