Patent US4052949A successfully refreshed from Google Patents.
US4052949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making easy open container end with protective edges for its severed score
Assignee: Crown Beverage Packaging LLC
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Filing: 1976-12-30
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Granted: 1977-10-11
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Expires: 1996-12-30
Abstract
Abstract An easy open container end having a pair of generally annular double-reverse folds with a common scored band between them that defines a removable panel wherein a smooth edge of each of the double-reverse folds protects the severed edge of the score upon removal of the panel from the container and a method for forming the improved easy open container end.
Inventors
- 👤 Keith R. Woodley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:03
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/383; B65; B65D; B65D17/00; B65D17/28; B65D17/401; B65D17/4011
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
200 words
A method of making an easy opening container end and comprising steps of providing a piece of sheet material including an annular radial section joined by an annular first connecting section to an axially displaced center section, and a generally curved section joined to said annular radial section by a second annular connecting section; providing an annular inwardly opening locking bend in said second connecting section; providing an annular outwardly opening bead in said second connecting section spaced from said locking bend toward said center section; converting said first connecting section into a generally axial wall and an expansion rib which circumscribes said center section; forming a score line of weaknesses in said radial section to define a panel at least partially removable from the piece of sheet material; axially compressing said expansion rib to force the end of said axial wall adjacent said expansion rib radially outwardly to form a Z-bend; clamping said locking bend; axially compressing said bead to form an outer double-reverse fold having the compressed bead overlying said score line; clamping said center section; axially compressing said Z-bend to form an inner double-reverse fold having the compressed lower bend of said Z-bend underlying said score line.
Claim 2
Independent Claim
200 words
A method of making an easy opening container end and comprising steps of providing a piece of sheet material including an annular radial section joined by an annular first connecting section to an axially displaced center section, and a generally curved section joined to said annular radial section by a second annular connecting section; providing an annular inwardly opening locking bend in said second connecting section; providing an annular outwardly opening bead in said second connecting section spaced from said locking bend toward said center section; converting said first connecting section into a generally axial wall and an expansion rib which circumscribes said center section; forming a score line of weaknesses in said radial section to define a panel at least partially removable from the piece of sheet material; axially compressing said expansion rib to force the end of said axial wall adjacent said expansion rib radially outwardly to form a Z-bend; clamping said locking bend; axially compressing said bead to form an outer double-reverse fold having the compressed bead overlying said score line; clamping said center section; axially compressing said Z-bend to form an inner double-reverse fold having the compressed lower bend of said Z-bend underlying said score line.
Claim 3
Dependent Claim
46 words
The method of claim 1 further comprising the steps of forming a rivet in the center section for attachment of a lifting tab adjacent to said score line; flattening said outer double-reverse fold outwardly from said score line and upwardly in the region of said rivet.
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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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |