Patent US4537327A successfully refreshed from Google Patents.
US4537327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape closure for a can end
Assignee: 3M Co
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Filing: 1984-09-13
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Granted: 1985-08-27
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Expires: 2004-09-13
Abstract
Abstract A container end assembly comprising a container end, typically metallic, with a pour opening therein; a coating over the container end comprising a carboxyl group-containing vinyl chloride/vinyl acetate copolymer composition, and a pressure-sensitive adhesive tape bonded to the coating which forms a bond thereto which is greater than that between the coating and the metallic container end, such that upon peeling of the tape from the container end, the coating delaminates in the area of the adhesive tape bond, and is removed with the tape, thus effectively masking the tape adhesive for tamper indication.
Inventors
- 👤 Shih-Lai Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:42
CPC Classifications
B; B65; B65D; B65D17/00; B65D17/50; B65D17/501; B65D17/502; B65D77/00; B65D77/22; B65D77/30; B65D77/32; B65D77/36; B65D2517/00; B65D2517/0001; B65D2517/001; B65D2517/0013; B65D2517/0058; B65D2517/008; B65D2517/0082; B65D2517/50; B65D2517/5002; B65D2517/5005; B65D2517/5016; B65D2517/5024; B65D2517/5032; B65D2517/5072; B65D2517/5083
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
A container end assembly comprising (a) a container end formed of metallic material having an exterior surface and an interior surface and being formed with a pour opening therein; (b) a coating over at least the exterior surface of said container end, said coating comprising a carboxyl group-containing vinyl chloride/vinyl acetate copolymeric composition; (c) a pressure sensitive tape bonded to an area of said exterior surface of said coating which is circumjacent and covers said pour opening, said pressure sensitive adhesive tape forming a bond to said coating which is greater than the bond between said coating and said container end, whereby upon peeling of said tape from said container end, said coating delaminates from said container end in the area of the pressure sensitive adhesive tape bond.
Claim 2
Dependent Claim
128 words
A container end assembly comprising (a) a container end formed of metallic material having an exterior surface and an interior surface and being formed with a pour opening therein; (b) a coating over at least the exterior surface of said container end, said coating comprising a carboxyl group-containing vinyl chloride/vinyl acetate copolymeric composition; (c) a pressure sensitive tape bonded to an area of said exterior surface of said coating which is circumjacent and covers said pour opening, said pressure sensitive adhesive tape forming a bond to said coating which is greater than the bond between said coating and said container end, whereby upon peeling of said tape from said container end, said coating delaminates from said container end in the area of the pressure sensitive adhesive tape bond.
Claim 3
Dependent Claim
21 words
The can end assembly of claim 1 wherein said container end is selected from tin-free steel, tin-plated steel, and black-plated steel.
Claim 4
Dependent Claim
20 words
The container end assembly of claim 1 further having interposed between said coating and said metallic material an enamel coating.
Claim 5
Dependent Claim
16 words
The container end assembly of claim 3 wherein said enamel coating comprises an epoxy phenolic composition.
Claim 6
Dependent Claim
31 words
The container end assembly of claim 1 wherein said copolymer composition comprises a mixture of a vinyl chloride/vinyl acetate copolymer and an effective amount of a compound containing carboxyl groups therein.
Claim 7
Dependent Claim
29 words
The container end assembly of claim 1 wherein said copolymer composition comprises a vinyl chloride/vinyl acetate copolymer containing an effective amount of carboxyl groups attached to the backbone thereof.
Claim 8
Dependent Claim
21 words
The container end assembly of claim 6 wherein said carboxyl groups conprise about 1 percent by weight of said copolymer composition.
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) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |