US3774801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced metal can end
Assignee: Primerica Inc
•
Filing: 1971-02-22
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Granted: 1973-11-27
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Expires: 1991-02-22
Abstract
Abstract A metal can end whose central panel has at least two peripheral, radially-separated, concave areas of curvature which provide the end with increased resistance against internal pressure. The panel may also include one or more peripheral steps or convex areas of curvature adjacent the concave areas of curvature.
Inventors
- 👤 E Gedde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:08
CPC Classifications
B; B65; B65D; B65D17/00; B65D17/28; B65D17/401; B65D17/4012
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
A metal can end for a pressurized container comprising: a rigid central panel having at least two peripheral, radiallyseparated, concave areas of curvature, a planar, upwardlyextending reinforcing central panel portion between said concave areas of curvature, a depressed, substantially U-shaped reinforcing groove contiguous with and peripheral to said panel, and a contiguous, peripheral, substantially upwardly extending countersink wall which merges with and terminates in a peripheral arcuate flange for attaching said end to said container, all portions of said central panel being such as to extend in an upward direction from said reinforcing groove toward a central area of said central panel, and the portion of said central panel radially inward of said concave areas of curvature being of a pre-domed configuration.
Claim 2
Dependent Claim
122 words
A metal can end for a pressurized container comprising: a rigid central panel having at least two peripheral, radiallyseparated, concave areas of curvature, a planar, upwardlyextending reinforcing central panel portion between said concave areas of curvature, a depressed, substantially U-shaped reinforcing groove contiguous with and peripheral to said panel, and a contiguous, peripheral, substantially upwardly extending countersink wall which merges with and terminates in a peripheral arcuate flange for attaching said end to said container, all portions of said central panel being such as to extend in an upward direction from said reinforcing groove toward a central area of said central panel, and the portion of said central panel radially inward of said concave areas of curvature being of a pre-domed configuration.
Claim 3
Dependent Claim
37 words
The metal can end of claim 1 wherein said can end is secured to said container body by a double seam formed by said arcuate flange of said end being interfolded with a peripheral container body flange.
Claim 4
Dependent Claim
12 words
The metal can end of claim 1 wherein said metal is steel.
Claim 5
Dependent Claim
117 words
A metal can end for a pressurized container comprising a rigid central panel having at least two peripheral, radially-separated, concave areas of curvature, a peripheral, convex area of curvature between and radially-separated from said concave areas of curvature, a depressed, substantially U-shaped reinforcing groove contiguous with and peripheral to said panel, and a contiguous, peripheral, substantially upwardly-extending countersink wall which merges with and terminates in a peripheral arcuate flange for attaching said end to said container, said convex area of curvature being in the form of a step no portion of which extends in a downward direction, and the portion of said central panel radially inward of said concave areas of curvature being of a pre-domed configuration.
Claim 6
Dependent Claim
117 words
A metal can end for a pressurized container comprising a rigid central panel having at least two peripheral, radially-separated, concave areas of curvature, a peripheral, convex area of curvature between and radially-separated from said concave areas of curvature, a depressed, substantially U-shaped reinforcing groove contiguous with and peripheral to said panel, and a contiguous, peripheral, substantially upwardly-extending countersink wall which merges with and terminates in a peripheral arcuate flange for attaching said end to said container, said convex area of curvature being in the form of a step no portion of which extends in a downward direction, and the portion of said central panel radially inward of said concave areas of curvature being of a pre-domed configuration.
Claim 7
Dependent Claim
37 words
The metal can end of claim 4 wherein said can end is secured to said container body by a double seam formed by said arcuate flange of said end being interfolded with a peripheral container body flange.
Claim 8
Dependent Claim
12 words
The metal can end of claim 5 wherein said metal is steel.
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |