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US3863801A Expired / Lapsed US ⏱️ 0.0 years remaining

Full-open end with cambered tab

Assignee: Primerica Inc
•
Filing: 1973-07-27
•
Granted: 1975-02-04
•
Expires: 1993-07-27
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Abstract

Abstract An improvement in a can end closure having a substantially flat, imperforate central wall with a peripheral flange adapted to be interfolded with an edge flange of a can body to form a doubleseam whose top portion is disposed above the central wall, a peripheral score defining a removable panel in the central wall, and an opening tab having a nose portion at the outer end adjacent the peripheral score and a handle portion at the inner end thereof, said tab being secured to the removable panel by a securement adjacent the nose portion. The improvement inhibits the raising of the tab when internal pressure is applied to the can and comprises a chamber and stress in the tab extending from at least about the securement to about the handle portion and a corresponding raised area of stress in the panel disposed beneath the cambered area of the tab. The stress in the raised area of the panel is caused by the cambered tab, after its being fastened to the panel, seeking to revert to its unstressed position existing prior to its fastening to the panel.

Inventors

  • 👤 Burton Frank Pillnik

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 22:13
CPC Classifications
B; B65; B65D; B65D17/00; B65D17/28; B65D17/401; B65D17/4011

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 168 words
In a can end closure having a substantially flat, imperforate central wall with a peripheral flange adapted to be interfolded with an edge flange of a can body to form a double seam whose top portion is disposed above the central wall, a peripheral score defining a removable panel in the central wall, and an opening tab having a nose portion at the outer end adjacent the peripheral score and a handle portion at the inner end thereof, said tab being secured to the removable panel by a securement adjacent the nose portion, the improvement which comprises a camber and stress in the tab extending from at least about the securement to about the handle portion and a corresponding raised area of stress in the panel disposed beneath the cambered area of the tab, whereby when the end closure is placed on a can and the closed can is subjected to internal pressure, the tab handle portion will not rise above the top portion of the double seam.
Claim 2
Dependent Claim 168 words
In a can end closure having a substantially flat, imperforate central wall with a peripheral flange adapted to be interfolded with an edge flange of a can body to form a double seam whose top portion is disposed above the central wall, a peripheral score defining a removable panel in the central wall, and an opening tab having a nose portion at the outer end adjacent the peripheral score and a handle portion at the inner end thereof, said tab being secured to the removable panel by a securement adjacent the nose portion, the improvement which comprises a camber and stress in the tab extending from at least about the securement to about the handle portion and a corresponding raised area of stress in the panel disposed beneath the cambered area of the tab, whereby when the end closure is placed on a can and the closed can is subjected to internal pressure, the tab handle portion will not rise above the top portion of the double seam.
Claim 3
Dependent Claim 22 words
The improvement defined in claim 1 wherein the tab handle portion has two opposing sides which make point contact with the panel.
Claim 4
Dependent Claim 21 words
The improvement defined in claim 2 wherein the innermost section of the tab handle portion is spaced from the removable panel.
Claim 5
Dependent Claim 12 words
The improvement defined in claim 3 wherein the securement is a rivet.
Claim 6
Dependent Claim 30 words
The improvement defined in claim 4 further including an ancillary score passing inward of the rivet and extending laterally therefrom to set off a pivotable section in said removable panel.
Claim 7
Dependent Claim 21 words
The improvement defined in claim 5 wherein the camber extends approximately to the midpoint of the sides of the handle portion.
Claim 8
Dependent Claim 17 words
The improvement defined in claim 6 wherein the camber extends from a point outward of the rivet.
Claim 9
Dependent Claim 35 words
The improvements defined in claim 7 wherein the tab has a curved peripheral edge and the camber extends from the starts of the curved peripheral edge, said starts making point contact with the removable panel.

References Cited (Backward Citations)

US3591038A Cited
US3799390A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-02-03 1978-08-05 1979-02-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-02-03 1982-08-05 1983-02-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-02-03 1986-08-05 1987-02-04 $7700.00 Window Closed / Lapsed

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