Patent US3886881A successfully refreshed from Google Patents.
US3886881A
Expired / Lapsed
US
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Method of making a press tab container end from a metallic shell
Assignee: Coors Container Co
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Filing: 1973-12-03
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Granted: 1975-06-03
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Expires: 1993-12-03
Abstract
Abstract The method of making a press tab container end having a hinged pour opening closure tab and a hinged pressure release vent closure tab, from a metallic shell which has a generally flat center portion provided with a drawn and curled peripheral area for subsequent attachment to the container body, comprising the steps of forming and lancing the closure tabs in the shell, reforming the closure tabs to flatten and enlarge their areas, coining the tabs to further enlarge the tabs and cause them to underlie the metal of the shell surrounding the openings produced by the lancing step, followed by preheating the shells and applying sealant to cover the seam between the overlapping shell areas and tabs to provide an air and fluid tight seal on the under side of the container end.
Inventors
- 👤 Ronald A Pearce
- 👤 Thomas R Herrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:51
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/383; B65; B65D; B65D17/00; B65D17/28; B65D17/401; B65D2205/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
196 words
The method of making a press tab container end from a metallic shell, said end having a hinged pour opening closure tab and a hinged pressure release vent closure tab, which comprises the steps of a. providing a metallic shell consisting of a generally flat central portion and a peripheral drawn and curled area which has gasket compound in said drawn and curled area, b. forming in the shell an upwardly opening circular groove surrounding each of the proposed areas of a pour opening closure tab and a pressure release vent closure tab, and forming a rib located radially inwardly of each of said grooves, c. lancing the mEtal slightly radially inwardly of the top of said ribs to cut the tab areas and small circumferential parts of said ribs from the shell excepting where the tabs are joined hingedly to the shell, d. reforming the shell to flatten and enlarge the tab areas, e. coining the reformed shell to make the tab edges underlie surrounding shell areas, and f. applying a sealant to the shell to cover the seam between the overlapping tabs and surrounding shell surfaces to provide an air and fluid tight seal.
Claim 2
Independent Claim
196 words
The method of making a press tab container end from a metallic shell, said end having a hinged pour opening closure tab and a hinged pressure release vent closure tab, which comprises the steps of a. providing a metallic shell consisting of a generally flat central portion and a peripheral drawn and curled area which has gasket compound in said drawn and curled area, b. forming in the shell an upwardly opening circular groove surrounding each of the proposed areas of a pour opening closure tab and a pressure release vent closure tab, and forming a rib located radially inwardly of each of said grooves, c. lancing the mEtal slightly radially inwardly of the top of said ribs to cut the tab areas and small circumferential parts of said ribs from the shell excepting where the tabs are joined hingedly to the shell, d. reforming the shell to flatten and enlarge the tab areas, e. coining the reformed shell to make the tab edges underlie surrounding shell areas, and f. applying a sealant to the shell to cover the seam between the overlapping tabs and surrounding shell surfaces to provide an air and fluid tight seal.
Claim 3
Independent Claim
196 words
The method of making a press tab container end from a metallic shell, said end having a hinged pour opening closure tab and a hinged pressure release vent closure tab, which comprises the steps of a. providing a metallic shell consisting of a generally flat central portion and a peripheral drawn and curled area which has gasket compound in said drawn and curled area, b. forming in the shell an upwardly opening circular groove surrounding each of the proposed areas of a pour opening closure tab and a pressure release vent closure tab, and forming a rib located radially inwardly of each of said grooves, c. lancing the mEtal slightly radially inwardly of the top of said ribs to cut the tab areas and small circumferential parts of said ribs from the shell excepting where the tabs are joined hingedly to the shell, d. reforming the shell to flatten and enlarge the tab areas, e. coining the reformed shell to make the tab edges underlie surrounding shell areas, and f. applying a sealant to the shell to cover the seam between the overlapping tabs and surrounding shell surfaces to provide an air and fluid tight seal.
Claim 4
Independent Claim
196 words
The method of making a press tab container end from a metallic shell, said end having a hinged pour opening closure tab and a hinged pressure release vent closure tab, which comprises the steps of a. providing a metallic shell consisting of a generally flat central portion and a peripheral drawn and curled area which has gasket compound in said drawn and curled area, b. forming in the shell an upwardly opening circular groove surrounding each of the proposed areas of a pour opening closure tab and a pressure release vent closure tab, and forming a rib located radially inwardly of each of said grooves, c. lancing the mEtal slightly radially inwardly of the top of said ribs to cut the tab areas and small circumferential parts of said ribs from the shell excepting where the tabs are joined hingedly to the shell, d. reforming the shell to flatten and enlarge the tab areas, e. coining the reformed shell to make the tab edges underlie surrounding shell areas, and f. applying a sealant to the shell to cover the seam between the overlapping tabs and surrounding shell surfaces to provide an air and fluid tight seal.
Claim 5
Dependent Claim
21 words
The method defined by claim 1, in which the shell is heated to approximately 160*-250* F. before the sealant is applied.
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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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |