Patent US4355935A successfully refreshed from Google Patents.
US4355935A
Expired / Lapsed
US
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Method of forming a can end having a vented gate within a push-down aperture
Assignee: Individual
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Filing: 1980-07-08
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Granted: 1982-10-26
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Expires: 2000-07-08
Abstract
Abstract A can end having a push-down gate for opening a can to which the end is affixed and having a push-down gate vent in the primary gate adapted to be opened before the gate is opened to relieve gas pressure from within the can.
Inventors
- 👤 Gerald B. Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:41
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/383; B65; B65D; B65D17/00; B65D17/50; B65D17/506; B65D2205/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
139 words
The method of forming a can end having a push-down multiple-fold primary aperture with a gate panel therebeneath for opening a can to which the end is affixed and having a push-down multiple-fold gated secondary venting aperture within said primary aperture for relieving pressure in a can before it is opened, said method including the steps of: (a) providing a metal sheet wherefrom metal end blanks are cut; (b) establishing the location of a circular end on the metal sheet; (c) establishing, within said location, selected positions for a primary aperture and for a secondary venting aperture within the primary aperture; (d) forming said multiple-fold primary aperture with a gate panel therebeneath in the metal sheet; (e) forming said multiple-fold gated secondary venting aperture within said primary aperture; and (f) thereafter cutting out the blank and finishing the end.
Claim 2
Independent Claim
139 words
The method of forming a can end having a push-down multiple-fold primary aperture with a gate panel therebeneath for opening a can to which the end is affixed and having a push-down multiple-fold gated secondary venting aperture within said primary aperture for relieving pressure in a can before it is opened, said method including the steps of: (a) providing a metal sheet wherefrom metal end blanks are cut; (b) establishing the location of a circular end on the metal sheet; (c) establishing, within said location, selected positions for a primary aperture and for a secondary venting aperture within the primary aperture; (d) forming said multiple-fold primary aperture with a gate panel therebeneath in the metal sheet; (e) forming said multiple-fold gated secondary venting aperture within said primary aperture; and (f) thereafter cutting out the blank and finishing the end.
Claim 3
Dependent Claim
37 words
The method defined in claim 1, wherein a score line is cut about at least a portion of the periphery of the primary aperture to define the gate panel therebeneath after the secondary venting aperture is formed.
Claim 4
Dependent Claim
26 words
The method defined in claim 2, further including the step of drawing the metal sheet into a frusto-conical shape with the primary aperture axially centered therein.
Claim 5
Dependent Claim
26 words
The method defined in claim 1, further including the step of drawing the metal sheet into a frusto-conical shape with the primary aperture axially centered therein.
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) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |