Patent US4018178A successfully refreshed from Google Patents.
US4018178A
Expired / Lapsed
US
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Method of manufacture of a gated can lid with score at upper surface
Assignee: Individual
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Filing: 1975-10-24
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Granted: 1977-04-19
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Expires: 1995-10-24
Abstract
Abstract A can lid includes a pushdown gate formed in a panel portion below a narrow, underfolded rim at the opening in the lid. The outline of the gate is a disruptible score cut in the panel portion underneath the rim. This structure is essentially the same as that disclosed in the Klein-Harper U.S. Pat. No. 3,334,775. However, the score cut defining the outline of the gate is at the upper surface of the panel portion instead of being at the undersurface. A method of drawing and folding the lid material permits the score line to be cut before the underfolded rim is formed over the score cut.
Inventors
- 👤 Gerald B. Klein
- 👤 Frank C. Lowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:59
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/383; B65; B65D; B65D17/00; B65D17/28; B65D17/401
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
The method of forming a can lid blank having a push-down gate in a panel portion of the lid below an aperture in the lid, with a narrow spacing rim underfolded about the aperture whose outward edge joins with the panel portion therebelow, and including the steps of: a. drawing a cup downwardly in the lid blank having a bottom area approximating the aforesaid panel portion; b. drawing a ridge upwardly from the lid blank whose inner wall forms the wall of the aforesaid cup; c. forming the aforesaid panel portion in the bottom of the cup; d. cutting a disruptible score line in the formed panel portion adjacent to the ridge to define the outline of the gate therein; and e. folding the ridge inwardly and downwardly to overlie the score line and form the aforesaid aperture.
Claim 2
Independent Claim
138 words
The method of forming a can lid blank having a push-down gate in a panel portion of the lid below an aperture in the lid, with a narrow spacing rim underfolded about the aperture whose outward edge joins with the panel portion therebelow, and including the steps of: a. drawing a cup downwardly in the lid blank having a bottom area approximating the aforesaid panel portion; b. drawing a ridge upwardly from the lid blank whose inner wall forms the wall of the aforesaid cup; c. forming the aforesaid panel portion in the bottom of the cup; d. cutting a disruptible score line in the formed panel portion adjacent to the ridge to define the outline of the gate therein; and e. folding the ridge inwardly and downwardly to overlie the score line and form the aforesaid aperture.
Claim 3
Dependent Claim
25 words
The method defined in claim 1, wherein: the walls of the ridge are pulled together and tipped inwardly slightly prior to the score cutting step.
Claim 4
Dependent Claim
22 words
The method defined in claim 1, including the step of: forming a dome in the panel prior to cutting the score line.
Claim 5
Independent Claim
132 words
The method of forming a can lid blank having a push-down gate in a panel portion of the lid below an aperture in the lid, with a narrow spacing rim underfolded about the aperture whose outward edge joins with the panel portion therebelow, and including the steps of: drawing a cup downwardly in the lid blank having a bottom area approximating the aforesaid panel portion in the bottom of the cup; cutting a disruptible scoreline in the formed panel portion adjacent to the ridge to define the outline of the gate therein, the panel portion at the scoreline being coined prior to the cutting thereof whereby to establish a uniform panel thickness at the score cut; and folding the ridge inwardly and downwardly to overlie the scoreline and form the aforesaid aperture.
Claim 6
Independent Claim
132 words
The method of forming a can lid blank having a push-down gate in a panel portion of the lid below an aperture in the lid, with a narrow spacing rim underfolded about the aperture whose outward edge joins with the panel portion therebelow, and including the steps of: drawing a cup downwardly in the lid blank having a bottom area approximating the aforesaid panel portion in the bottom of the cup; cutting a disruptible scoreline in the formed panel portion adjacent to the ridge to define the outline of the gate therein, the panel portion at the scoreline being coined prior to the cutting thereof whereby to establish a uniform panel thickness at the score cut; and folding the ridge inwardly and downwardly to overlie the scoreline and form the aforesaid aperture.
Claim 7
Dependent Claim
48 words
The method defined in claim 4, wherein: the panel portion is coined in the region of the score line, at each side, thereof, whereby to increase the metal surface available to the panel and predispose the ridge to tip towards the panel to simplify the subsequent compression operation.
References Cited (Backward Citations)
US3705563A
Cited
US3880316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |