Patent US3728980A successfully refreshed from Google Patents.
US3728980A
Expired / Lapsed
US
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Scoring die
Assignee: Individual
•
Filing: 1971-02-10
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Granted: 1973-04-24
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Expires: 1991-02-10
Abstract
Abstract A tool for forming a score in a can end to define an easyopening tear strip. In lateral cross section, the scoring die comprises a five-sided element having a leading edge with a very narrow planar surface, a pair of highly finished side faces extending outwardly on either side of the leading edge at first, smaller angles relative to the plane of the leading edge, and a second pair of faces extending upwardly from the highly finished faces at second, larger angles relative to the plane of the leading edge.
Inventors
- 👤 E Fraze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:07
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/383; Y; Y10; Y10T; Y10T83/00; Y10T83/02; Y10T83/0333
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
76 words
A tool for scoring can ends to provide a tear strip therein comprising: a movable press member a tool fastened to said press member having a relatively narrow leading edge defining a flat surface, a first set of side faces extending outwardly and upwardly from said leading edge toward said movable press member, and a second set of side faces extending outwardly and upwardly from said first set of side faces toward said movable press member.
Claim 2
Dependent Claim
76 words
A tool for scoring can ends to provide a tear strip therein comprising: a movable press member a tool fastened to said press member having a relatively narrow leading edge defining a flat surface, a first set of side faces extending outwardly and upwardly from said leading edge toward said movable press member, and a second set of side faces extending outwardly and upwardly from said first set of side faces toward said movable press member.
Claim 3
Dependent Claim
33 words
The tool of claim 1 wherein said first set of side faces are formed at smaller angles, relative to a plane including said leading edge, than are said second set of side faces.
Claim 4
Dependent Claim
19 words
The tool of claim 1 wherein said first set of side faces are provided with relatively friction free surfaces.
Claim 5
Dependent Claim
115 words
A tool for scoring can ends to produce a removable tear strip therein comprising in cross section, a narrow leading edge extending for initial contact with a can end to commence penetration thereof in forming the score, a first side face extending from said leading edge for secondary contact with a can end to move metal therein away from the score being formed by the penetration of said leading edge, and a second side face extending from said first Side face for tertiary contact with a can end to move metal therein away from the score being formed, in a vector direction different from that in which metal is moved by said first side face.
Claim 6
Dependent Claim
115 words
A tool for scoring can ends to produce a removable tear strip therein comprising in cross section, a narrow leading edge extending for initial contact with a can end to commence penetration thereof in forming the score, a first side face extending from said leading edge for secondary contact with a can end to move metal therein away from the score being formed by the penetration of said leading edge, and a second side face extending from said first Side face for tertiary contact with a can end to move metal therein away from the score being formed, in a vector direction different from that in which metal is moved by said first side face.
Claim 7
Dependent Claim
66 words
The tool of claim 4 wherein said narrow leading edge presents a flat surface to a can end being scored, said first side face is formed at a first angle relative to a plane including said flat surface, said second side face is formed at a second angle relative to a plane including said flat surface, and said first angle is smaller than said second angle.
Claim 8
Dependent Claim
12 words
The tool of claim 5 wherein said first angle is approximately 45*
Claim 9
Dependent Claim
12 words
The tool of claim 5 wherein said second angle is approximately 60*
Claim 10
Dependent Claim
16 words
The tool of claim 5 wherein said flat surface is approximately 0.001 to 0.002 inch wide.
Claim 11
Independent Claim
72 words
The method of scoring a can end so as to create a severable residual therein comprising the steps of penetrating said can end across a relatively narrow dimension a distance sufficient to leave the desired residual, enlarging the penetration above the residue by forcing metal away therefrom at an angle of about 45*, and enlarging the penetration above the first enlargement by forcing metal away therefrom at an angle of about 60*.
Claim 12
Independent Claim
72 words
The method of scoring a can end so as to create a severable residual therein comprising the steps of penetrating said can end across a relatively narrow dimension a distance sufficient to leave the desired residual, enlarging the penetration above the residue by forcing metal away therefrom at an angle of about 45*, and enlarging the penetration above the first enlargement by forcing metal away therefrom at an angle of about 60*.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |