US3870001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Can end with inseparable tear strip
Assignee: Dayton Reliable Tool and Manufacturing Co
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Filing: 1973-01-08
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Granted: 1975-03-11
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Expires: 1993-01-08
Abstract
Abstract A can end in which the tear strip is defined by a noncontinuous score which is formed so that the tear strip is prevented from being completely removed from the can ends. Coined formations are positioned in the area about the score line to prevent the formation of sharp edges against which a user could cut himself. In one embodiment of the invention, the end wall is coined so as to form a score ledge situated beneath the horizontal plane of the end wall and the tear strip is further coined or formed to a position beneath the horizontal plane of the score ledge. When a score is formed in the ledge, the tear strip is coined slightly further away from the horizontal plane of the ledge to absorb the metal flowing away from the score. In another embodiment, ridges are coined into the end wall and the tear strip on opposite sides of the legs of the score to accomplish the same result.
Inventors
- 👤 Omar L Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:12
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/383; B65; B65D; B65D17/00; B65D17/28; B65D17/401; B65D17/4012
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
230 words
A method of forming an easy open can end having an end wall and a removable tear portion in the end wall which is at least partially circumscribed by a score line in the can end, said method comprising: coining a can end wall to define a planar coined border which at least partially circumscribes a tear portion; forming a first offset surface in said can end which is inclined vertically to the plane of said coined border and lies outside of said border; forming a second offset surface in said can end which is inclined vertically to the plane of said coined border and lies inside said coined border within said tear strip. forming a score line within said coined border, placing said score line between said first and second offset surfaces and sufficiently close to both of said offset surfaces to provide protection from The second offset surface against cuts from the sharp edge on the tear portion and protection from the first offset surface against cuts from the sharp edge remaining on the can end after severance of the can end along the score line in at least partial removal of the tear strip from the can end, and said coined border being formed in a plane which is intermediate to the plane of said tear portion and the plane of the balance of said end wall.
Claim 2
Independent Claim
230 words
A method of forming an easy open can end having an end wall and a removable tear portion in the end wall which is at least partially circumscribed by a score line in the can end, said method comprising: coining a can end wall to define a planar coined border which at least partially circumscribes a tear portion; forming a first offset surface in said can end which is inclined vertically to the plane of said coined border and lies outside of said border; forming a second offset surface in said can end which is inclined vertically to the plane of said coined border and lies inside said coined border within said tear strip. forming a score line within said coined border, placing said score line between said first and second offset surfaces and sufficiently close to both of said offset surfaces to provide protection from The second offset surface against cuts from the sharp edge on the tear portion and protection from the first offset surface against cuts from the sharp edge remaining on the can end after severance of the can end along the score line in at least partial removal of the tear strip from the can end, and said coined border being formed in a plane which is intermediate to the plane of said tear portion and the plane of the balance of said end wall.
Claim 3
Independent Claim
230 words
A method of forming an easy open can end having an end wall and a removable tear portion in the end wall which is at least partially circumscribed by a score line in the can end, said method comprising: coining a can end wall to define a planar coined border which at least partially circumscribes a tear portion; forming a first offset surface in said can end which is inclined vertically to the plane of said coined border and lies outside of said border; forming a second offset surface in said can end which is inclined vertically to the plane of said coined border and lies inside said coined border within said tear strip. forming a score line within said coined border, placing said score line between said first and second offset surfaces and sufficiently close to both of said offset surfaces to provide protection from The second offset surface against cuts from the sharp edge on the tear portion and protection from the first offset surface against cuts from the sharp edge remaining on the can end after severance of the can end along the score line in at least partial removal of the tear strip from the can end, and said coined border being formed in a plane which is intermediate to the plane of said tear portion and the plane of the balance of said end wall.
Claim 4
Independent Claim
230 words
A method of forming an easy open can end having an end wall and a removable tear portion in the end wall which is at least partially circumscribed by a score line in the can end, said method comprising: coining a can end wall to define a planar coined border which at least partially circumscribes a tear portion; forming a first offset surface in said can end which is inclined vertically to the plane of said coined border and lies outside of said border; forming a second offset surface in said can end which is inclined vertically to the plane of said coined border and lies inside said coined border within said tear strip. forming a score line within said coined border, placing said score line between said first and second offset surfaces and sufficiently close to both of said offset surfaces to provide protection from The second offset surface against cuts from the sharp edge on the tear portion and protection from the first offset surface against cuts from the sharp edge remaining on the can end after severance of the can end along the score line in at least partial removal of the tear strip from the can end, and said coined border being formed in a plane which is intermediate to the plane of said tear portion and the plane of the balance of said end wall.
Claim 5
Dependent Claim
36 words
The method of claim 1 including deforming said tear portion to move the plane of said tear portion away from the plane of said coined border as said score line is formed within said coined border.
Claim 6
Dependent Claim
29 words
The method of claim 1 wherein said score line is formed by penetrating said coined border to a depth of approximately 50 percent of the thickness of said border.
Claim 7
Dependent Claim
26 words
The method of claim 1 including forming said score line with end configurations which prevent the complete separation of said tear strip from said can end.
References Cited (Backward Citations)
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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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |