US4685849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making an easy opening container end closure
Assignee: Alcoa Corp
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Filing: 1986-08-04
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Granted: 1987-08-11
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Expires: 2006-08-04
Abstract
Abstract A closure for closing the open end of a container having contents therein which dissociate a gas therefrom. The closure is adapted to provide an opening for access to the contents. The opening is adapted for a snap assembly with a plastic cap to effect a substantially gas-tight seal of the opening under high pressures to enable resealing of the container after dispensing a portion of the contents.
Inventors
- 👤 Robert L. LaBarge
- 👤 Robert E. Heffner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:14
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/383; B65; B65D; B65D17/00; B65D17/28; B65D17/401; B65D17/4012; B65D17/4014; B65D41/00; B65D41/02; B65D41/16; B65D41/18; B65D47/00; B65D47/04; B65D47/06; B65D47/08; B65D47/0857; B65D47/0876; B65D2251/00; B65D2251/10; B65D2251/1016; B65D2251/105; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49938
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
102 words
A method of making an end closure for a container comprising the steps of: providing a metal blank having an end wall and means for attaching the end wall to the open mouth of a container; forming an upwardly projecting spout having a sidewall and an end wall in the end wall of the blank: coining a marginal portion of the end wall around the periphery of the spout to extrude metal outwardly to form a continuous lip on the spout, with the lip having a top wall, a bottom wall, and an outwardly arcuate wall connecting the top and bottom walls.
Claim 2
Independent Claim
102 words
A method of making an end closure for a container comprising the steps of: providing a metal blank having an end wall and means for attaching the end wall to the open mouth of a container; forming an upwardly projecting spout having a sidewall and an end wall in the end wall of the blank: coining a marginal portion of the end wall around the periphery of the spout to extrude metal outwardly to form a continuous lip on the spout, with the lip having a top wall, a bottom wall, and an outwardly arcuate wall connecting the top and bottom walls.
Claim 3
Dependent Claim
50 words
A method of forming an end closure as claimed in claim 1 wherein the step of forming the spout includes a first step of forming an upwardly projecting bubble having a lesser diameter than the closure end wall in a portion of the closure end wall near the periphery thereof.
Claim 4
Dependent Claim
81 words
A method of forming an end closure as claimed in claim 2 whereby the step of forming the spout includes a step of reforming the bubble into a shape which is frustoconical in cross section having an outwardly and downwardly sloping sidewall and coining a portion of the sidewall to be subsequently formed into the lip to produce a length having zones of varying thickness to insure that when the lip is subsequently formed it will conform to a desired contour.
Claim 5
Dependent Claim
84 words
A method of forming an end closure as claimed in claim 3 whereby the step of providing a metal blank further includes providing a metal blank having a sidewall projecting upwardly from the margin of the end wall as the means for attaching the end wall to the container mouth, and forming a downwardly projecting stiffening groove at the junction of the closure end wall and sidewall in a step which is subsequent to the step of reforming the bubble into a frustoconical shape.
Claim 6
Dependent Claim
59 words
A method of forming an end closure as claimed in claim 4 whereby the groove is formed in two stages with the groove formed to have a first radius in a first stage and is reformed in a second stage to have a second radius smaller than the first to provide a groove affording a greater resistance to buckling.
Claim 7
Dependent Claim
32 words
A method of forming an end closure as claimed in claim 4 whereby the step of providing a metal blank includes providing a blank having an outwardly projecting step in the sidewall.
Claim 8
Dependent Claim
46 words
A method of forming an end closure as claimed in claim 1 which further includes forming a score in the spout end wall which defines the margin of an opening panel which is at least partially separable from the spout end wall by fracturing the score.
Claim 9
Dependent Claim
30 words
A method of forming an end closure as claimed in claim 7 which further includes forming the opening panel portion of the spout end wall to be slightly concave downwardly.
Claim 10
Dependent Claim
29 words
A method of forming an end closure as claimed in claim 7 which further includes reforming the outer arcuate lip wall so as to have a smaller outer radius.
Claim 11
Dependent Claim
39 words
A method of forming an end closure as claimed in claim 1 which further includes forming an upwardly projecting integral rivet shank for attaching a plastic cap adapted for a sealing engagement with the spout to the closure end.
Claim 12
Dependent Claim
80 words
A method of forming an end closure as claimed in claim 10 which further includes providing a plastic cap adapted for sealing engagement with the spout lip to seal an opening in the spout end and further adapted with an arm having a hole therein for attaching the cap to the container closure and positioning the rivet shank in the cap arm hole and staking the rivet thereafter to form a head and thereby attach the cap to the closure.
Claim 13
Dependent Claim
84 words
A method of forming an end closure as claimed in claim 11 whereby the step of providing the plastic cap includes providing the cap arm with a portion around the hole which slopes downwardly from the top surface of the arm and the staking step includes staking the rivet to form a head which slopes downwardly engaging the downwardly sloping arm portion between the head and the container closure end wall in a manner which permits rotation of the cap about the rivet shaft.
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) | 1990-08-10 | 1991-02-09 | 1991-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-10 | 1995-02-09 | 1995-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-10 | 1999-02-09 | 1999-08-11 | $7700.00 | Window Closed / Lapsed |