US5197618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tamper-evident fusion bonded pull-tab induction foil lining system for container closures
Assignee: Selig Sealing Products Inc
•
Filing: 1991-10-15
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Granted: 1993-03-30
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Expires: 2011-10-15
Abstract
Abstract A tamper-evident multiple layer induction foil liner for sealing the opening of a container comprises a "sandwich" having a first layer in the form of a fusion-bond heat seal polymer. This heat seal polymer is fusion bonded to the lip of the container opening to secure the liner to the opening. The next layer is a low-cohesive strength layer which, in turn, is bonded to an aluminum foil layer strengthed with tear-resistant backing. A pull-tab is provided to facilitate removal of the liner after the cap is removed from the container. When the pull-tab is lifted, the low-cohesive strength layer splits or shears through the application of a relatively small amount of force. Thus, the aluminum foil and tear-resistant backing readily may be removed from the container opening. It is then a simple matter to puncture the thin and mechanically weak polymer layer to uncover the container opening. A residue of the fusion bonded polymer, with a surface covering of a portion of the sheared low-cohesive strength layer, provides a readily observable tamper-evident residue on the lip of the container opening after the liner has been removed.
Inventors
- 👤 Thomas P. Goth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:45
CPC Classifications
B; B65; B65D; B65D77/00; B65D77/10; B65D77/20; B65D77/2024; B65D77/2028; B65D77/2032; B65D51/00; B65D51/18; B65D51/20; B65D2251/00; B65D2251/0003; B65D2251/0006; B65D2251/0015; B65D2251/0068; B65D2251/0093; B65D2577/00; B65D2577/10; B65D2577/20; B65D2577/2041; B65D2577/205
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
112 words
A liner for use in closing a container opening in induction-sealed systems, said liner including in combination: a fusion-bond heat seal polymer layer for fusion bonding to a container opening; a relatively high-strength backing layer; and a relatively low-cohesive strength layer between, and bonded to, said polymer layer and said backing layer, said low-cohesive strength layer shearing, upon removal of said backing layer by mechanical forces, to separate said backing layer, with a first portion of the low-cohesive strength layer adhering thereto, from said polymer layer, with a second portion of the low-cohesive strength layer adhering to said polymer layer as a relatively low pressure rupturable tamper-evident cover over the container opening.
Claim 2
Dependent Claim
112 words
A liner for use in closing a container opening in induction-sealed systems, said liner including in combination: a fusion-bond heat seal polymer layer for fusion bonding to a container opening; a relatively high-strength backing layer; and a relatively low-cohesive strength layer between, and bonded to, said polymer layer and said backing layer, said low-cohesive strength layer shearing, upon removal of said backing layer by mechanical forces, to separate said backing layer, with a first portion of the low-cohesive strength layer adhering thereto, from said polymer layer, with a second portion of the low-cohesive strength layer adhering to said polymer layer as a relatively low pressure rupturable tamper-evident cover over the container opening.
Claim 3
Dependent Claim
14 words
The combination according to claim 1 wherein said polymer layer is a polymer membrane.
Claim 4
Dependent Claim
22 words
The combination according to claim 2 wherein said low-cohesive strength layer is selected from the class of paper, glassine, and non-woven fabric.
Claim 5
Dependent Claim
39 words
The combination according to claim 3 further including a pull-tab extending outwardly from said liner to facilitate removal of said backing layer by shearing said low-cohesive strength layer when said pull tab is pulled to produce said mechanical forces.
Claim 6
Dependent Claim
61 words
The combination according to claim 4 wherein said backing layer comprises a first portion in the form of a metal foil having two surfaces, and a second portion in the form of a tear-resistant backing, with the tear-resistant backing bonded to one surface of the metal foil, and said low-cohesive strength layer bonded to the other surface of said metal foil.
Claim 7
Dependent Claim
13 words
The combination according to claim 5 wherein said metal foil is aluminum foil.
Claim 8
Dependent Claim
22 words
The combination according to claim 1 wherein said low-cohesive strength layer is selected from the class of paper, glassine, and non-woven fabric.
Claim 9
Dependent Claim
39 words
The combination according to claim 7 further including a pull-tab extending outwardly from said liner to facilitate removal of said backing layer by shearing said low-cohesive strength layer when said pull tab is pulled to produce said mechanical forces.
Claim 10
Dependent Claim
61 words
The combination according to claim 1 wherein said backing layer comprises a first portion in the form of a metal foil having two surfaces, and a second portion in the form of a tear-resistant backing, with the tear-resistant backing bonded to one surface of the metal foil, and said low-cohesive strength layer bonded to the other surface of said metal foil.
Claim 11
Dependent Claim
13 words
The combination according to claim 9 wherein said metal foil is aluminum foil.
Claim 12
Dependent Claim
39 words
The combination according to claim 1 further including a pull-tab extending outwardly from said liner to facilitate removal of said backing layer by shearing said low-cohesive strength layer when said pull tab is pulled to produce said mechanical forces.
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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) | 1996-03-29 | 1996-09-28 | 1997-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-29 | 2000-09-28 | 2001-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-29 | 2004-09-28 | 2005-03-30 | $7700.00 | Window Closed / Lapsed |