Patent US4297778A successfully refreshed from Google Patents.
US4297778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for removing liners from metal closures
Assignee: Alcoa Corp
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Filing: 1980-04-28
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Granted: 1981-11-03
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Expires: 2000-04-28
Abstract
Abstract A method and apparatus for separating a liner from a formed metal closure by at least partially everting the closure so as to make the liner accessible for separation from the closure.
Inventors
- 👤 Earl E. Rumberger
- 👤 Frank M. Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:29
CPC Classifications
B; B23; B23P; B23P19/00; B23P19/02; B23P19/025; Y; Y10; Y10T; Y10T156/00; Y10T156/19; Y10T156/1978; Y10T156/1983; Y10T29/00; Y10T29/49; Y10T29/49751; Y10T29/49755; Y10T29/49815; Y10T29/49821; Y10T29/49822; Y10T29/53; Y10T29/53683
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
73 words
A method of separating a liner from a metal closure having a cylindrical skirt and a top end wall having an exterior surface and an interior surface against which a liner is disposed, comprising: supporting the closure; pressing against a central portion of the outer surface of the closure end wall and at least partially everting said closure to make said liner accessible for separation; and separating said liner from the everted closure.
Claim 2
Independent Claim
73 words
A method of separating a liner from a metal closure having a cylindrical skirt and a top end wall having an exterior surface and an interior surface against which a liner is disposed, comprising: supporting the closure; pressing against a central portion of the outer surface of the closure end wall and at least partially everting said closure to make said liner accessible for separation; and separating said liner from the everted closure.
Claim 3
Dependent Claim
24 words
A method as described in claim 1 which includes at least partially melting the liner at the interface between the liner and the closure.
Claim 4
Dependent Claim
26 words
A method as described in claim 1 in which the skirt of the closure has an annular terminal edge which is supported during said pressing operation.
Claim 5
Dependent Claim
21 words
A method as described in claim 1 which includes peeling a liner from an everted closure having the liner bonded thereto.
Claim 6
Dependent Claim
99 words
Apparatus for separating a liner from a metal closure having a cylindrical skirt and a top end wall having an exterior surface and an interior surface against which a liner is disposed, comprising: a support means for supporting a metal closure so that the closure may be at least partially everted; a pressing means disposed above said support means for pressing against a central portion of the outer surface of the closure end wall while the closure is supported on said support means; and a separating means disposed below said support means for separating the liner from the closure.
Claim 7
Dependent Claim
99 words
Apparatus for separating a liner from a metal closure having a cylindrical skirt and a top end wall having an exterior surface and an interior surface against which a liner is disposed, comprising: a support means for supporting a metal closure so that the closure may be at least partially everted; a pressing means disposed above said support means for pressing against a central portion of the outer surface of the closure end wall while the closure is supported on said support means; and a separating means disposed below said support means for separating the liner from the closure.
Claim 8
Dependent Claim
32 words
Apparatus as described in claim 5 which includes a heating means contained within said pressing means for at least partially melting the liner at the interface of the liner and the closure.
Claim 9
Dependent Claim
14 words
Apparatus as described in claim 5 wherein said separating means is a wire brush.
Claim 10
Dependent Claim
13 words
Apparatus as described in claim 5 wherein said separating means is a chisel.
Claim 11
Dependent Claim
13 words
Apparatus as described in claim 5 wherein said pressing means is a punch.
Claim 12
Dependent Claim
18 words
Apparatus as described in claim 5 wherein said support means is a die having a circular opening therein.
Claim 13
Dependent Claim
16 words
Apparatus as described in claim 10 wherein said die includes an annular ledge adjacent the opening.
Claim 14
Dependent Claim
79 words
Apparatus for separating a liner from a metal closure having a cylindrical skirt and a top end wall having an exterior surface and an interior surface against which a liner is disposed, comprising: a die having a circular opening therein; a punch, coaxially aligned with the die opening, disposed above said die and the closure supported and retained thereon; and a separating means disposed below said die and adjacent to the opening for separating the liner from the closure.
Claim 15
Dependent Claim
79 words
Apparatus for separating a liner from a metal closure having a cylindrical skirt and a top end wall having an exterior surface and an interior surface against which a liner is disposed, comprising: a die having a circular opening therein; a punch, coaxially aligned with the die opening, disposed above said die and the closure supported and retained thereon; and a separating means disposed below said die and adjacent to the opening for separating the liner from the closure.
Claim 16
Dependent Claim
30 words
Apparatus as described in claim 12 which includes a heating means within said punch for at least partially melting the liner at the interface of the liner and the closure.
Claim 17
Dependent Claim
17 words
Apparatus as described in claim 12 which includes an annular ledge adjacent the opening in said die.
Claim 18
Dependent Claim
14 words
Apparatus as described in claim 12 wherein said separating means is a wire brush.
Claim 19
Dependent Claim
13 words
Apparatus as described in claim 12 wherein said separating means is a chisel.
References Cited (Backward Citations)
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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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |