US4564121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape closure for a can end
Assignee: 3M Co
•
Filing: 1983-12-14
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Granted: 1986-01-14
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Expires: 2003-12-14
Abstract
Abstract A tape closure which is adhesively adhered about a pour opening on the exterior surface of a can end having a protective polymeric layer over the metallic can end which is adhered to the tape adhesive with a bond greater than the bond between the layer and the supporting surface therefor affording removal of the layer upon breaking the coating and delaminating the same from the support surface upon removal of the tape.
Inventors
- 👤 Wilfred R. Brochman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:27
CPC Classifications
B; B65; B65D; B65D17/00; B65D17/50; B65D17/501; B65D17/505; B65D2517/00; B65D2517/0001; B65D2517/001; B65D2517/0013; B65D2517/0058; B65D2517/008; B65D2517/0082; B65D2517/0091; B65D2517/0094; B65D2517/50; B65D2517/5002; B65D2517/5024; B65D2517/5032; B65D2517/5035; B65D2517/5072; B65D2517/5083
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
134 words
A container end assembly comprising: a container end formed of tin-free steel having an exterior surface and an interior surface and being formed with a pour opening; a polymeric layer comprised of a vinyl chloride/vinyl acetate copolymer bonded to said exterior surface of said end; and a tape strip comprising a backing coated on one surface with a thermoplastic adhesive and bonded by said adhesive to an area of the exterior surface of said layer circumjacent and covering said pour opening, said adhesive forming a bond between said tape strip and said layer having greater strength than the bond between said layer and the exterior surface of said tin-free steel end supporting said layer, causing said layer to break and peel from said end upon removal of the tape strip from the container end.
Claim 2
Dependent Claim
134 words
A container end assembly comprising: a container end formed of tin-free steel having an exterior surface and an interior surface and being formed with a pour opening; a polymeric layer comprised of a vinyl chloride/vinyl acetate copolymer bonded to said exterior surface of said end; and a tape strip comprising a backing coated on one surface with a thermoplastic adhesive and bonded by said adhesive to an area of the exterior surface of said layer circumjacent and covering said pour opening, said adhesive forming a bond between said tape strip and said layer having greater strength than the bond between said layer and the exterior surface of said tin-free steel end supporting said layer, causing said layer to break and peel from said end upon removal of the tape strip from the container end.
Claim 3
Dependent Claim
67 words
A container end assembly according to claim 1 wherein said tape strip backing comprises a flexible film selected from the group consisting of polycarbonate, polytetramethylene terephthalate, polyamide derived from 6-6 nylon, physical blends of polytetramethylene terephthalate/polyethylene, physical blends of polytetramethylene terephthalate/phenoxy, glycol modified polyethylene terephthalate, polyvinylchloride, polypropylene, and films derived from a graft copolymer comprising acrylonitrile/methylmethacrylate copolymer grafted onto an acrylonitrile/butadiene copolymer backbone, or thin foil-film composites.
Claim 4
Dependent Claim
15 words
A container end assembly according to claim 1 wherein said adhesive is a thermoplastic polyurethane.
Claim 5
Dependent Claim
15 words
A container end assembly according to claim 2 wherein said adhesive is a thermoplastic polyurethane.
Claim 6
Dependent Claim
137 words
A container end assembly according to claim 1 wherein said adhesive forming a bond between said tape strip and said polymeric layer forms a bond which is stronger in shear and tension than the bond between said layer and said surface supporting said layer and said layer is stronger than said bond between said layer and said surface supporting said layer whereby upon peeling of the tape strip from said container end said layer breaks and delaminates from the end in the area of the adhesive bond to said layer, peeling said layer in said area from said end upon removal of the tape strip from the container end, and a second interior tape is bonded to at least one protective layer on said interior surface of said end and to said adhesive through said pour opening.
Claim 7
Dependent Claim
13 words
A container end assembly according to claim 1 wherein said backing is polycarbonate.
Claim 8
Dependent Claim
21 words
A container end assembly according to claim 1 wherein said backing comprises a polycarbonate resin and said thermoplastic adhesive comprises polyurethane.
References Cited (Backward Citations)
US3052246A
Cited
US3312368A
Cited
US3338462A
Cited
US3367481A
Cited
US3391847A
Cited
US3343657A
Cited
US3378020A
Cited
GB1197161A
Cited
US3655503A
Cited
US3524455A
Cited
US3770113A
Cited
DE2301538A1
Cited
US4029033A
Cited
US3990579A
Cited
US3997049A
Cited
US4034132A
Cited
US4167283A
Cited
US4210255A
Cited
US4167234A
Cited
US4163506A
Cited
US4280653A
Cited
US4332318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |