Patent US4398875A successfully refreshed from Google Patents.
US4398875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding tool for forming a closure shell liner
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1981-04-21
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Granted: 1983-08-16
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Expires: 2001-04-21
Abstract
Abstract A molding tool for forming a closure shell liner on the inside surface of a closure shell having a skirt with a groove therein. The tool has a central molding member and a shell positioning sleeve concentric with and external of the central member with the sleeve having an upper portion adapted to be positioned opposite the groove in the skirt of the shell and a lower portion extending to the lower end of the sleeve. The outer diameter of the upper portion of the sleeve exceeds the outer diameter of the lower portion by an amount equal to twice the depth of the groove.
Inventors
- 👤 Masayoshi Kawashima
- 👤 Akio Yuasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:37
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/68; B29C70/78; B29C70/80; B29C33/00; B29C33/0038; Y; Y10; Y10S; Y10S425/00; Y10S425/809
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
157 words
A molding tool for forming a closure shell liner on the inside surface of a circular top panel of a closure shell where the shell has a cylindrical skirt extending downwardly from the peripheral edge of the top panel and a circumferentially extending annular groove formed on the upper portion of the skirt, and where the tool comprises a central molding member and a shell positioning external sleeve disposed externally of the central molding member; characterized in that said sleeve has an upper portion extending axially downwardly substantially to a point opposite said groove when said tool is inserted into said shell and a lower portion extending axially downwardly from said point to the lower end of said sleeve and wherein the outer diameter of the upper portion of the sleeve exceeds the outer diameter of the lower portion of the sleeve by an amount equal to twice the radial depth of the groove in the skirt.
Claim 2
Dependent Claim
157 words
A molding tool for forming a closure shell liner on the inside surface of a circular top panel of a closure shell where the shell has a cylindrical skirt extending downwardly from the peripheral edge of the top panel and a circumferentially extending annular groove formed on the upper portion of the skirt, and where the tool comprises a central molding member and a shell positioning external sleeve disposed externally of the central molding member; characterized in that said sleeve has an upper portion extending axially downwardly substantially to a point opposite said groove when said tool is inserted into said shell and a lower portion extending axially downwardly from said point to the lower end of said sleeve and wherein the outer diameter of the upper portion of the sleeve exceeds the outer diameter of the lower portion of the sleeve by an amount equal to twice the radial depth of the groove in the skirt.
Claim 3
Dependent Claim
59 words
A molding tool according to claim 1 characterized in that a tapered axially extending surface joins the upper portion of the sleeve with the lower portion of the sleeve and in that the outer diameter of the upper portion of the sleeve substantially corresponds to the inside diameter of the open end of the cyclindrical skirt of the shell.
References Cited (Backward Citations)
US945357A
Cited
US1989725A
Cited
AT177081B
Cited
US3004297A
Cited
GB1080654A
Cited
US3547746A
Cited
ES144178Y
Cited
ES379912A1
Cited
GB1369415A
Cited
US3828963A
Cited
US3958910A
Cited
US3950119A
Cited
FR2307593B1
Cited
GB2022063B
Cited
US4274822A
Cited
US4312824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |