US5153042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tamper-indicating labelstock
Assignee: 3M Co
•
Filing: 1989-05-16
•
Granted: 1992-10-06
•
Expires: 2009-05-16
Abstract
Abstract A labelstock, which after being carefully removed cannot be re-applied without leaving an unmistakable warning of tampering. If comprises a transparent facestock, a release coating forming an indicia attached to the facestock, a primer covering the facestock and release coating, a frangible metal layer covering the primer and an adhesive covering the metal layer.
Inventors
- 👤 Kenneth W. Indrelie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:40
CPC Classifications
G; G09; G09F; G09F3/00; G09F3/02; G09F3/0291; G09F3/0292; Y; Y10; Y10S; Y10S428/00; Y10S428/916; Y10T; Y10T428/00; Y10T428/14; Y10T428/1438; Y10T428/1443
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
94 words
Labelstock comprising a) a transparent facestock, b) a transparent release coating attached to a portion of one surface of the facestock for providing an indicia, c) a transparent primer attached to said surface of the facestock and said release coating forming a relatively continuous planar surface on said surface of the facestock, d) a relatively planar, frangible, visible metal layer attached to said primer layer, and e) an adhesive layer attached to said metal layer; wherein said indicia is not visible until becoming permanently visible when said facestock is separated from said release coating.
Claim 2
Dependent Claim
94 words
Labelstock comprising a) a transparent facestock, b) a transparent release coating attached to a portion of one surface of the facestock for providing an indicia, c) a transparent primer attached to said surface of the facestock and said release coating forming a relatively continuous planar surface on said surface of the facestock, d) a relatively planar, frangible, visible metal layer attached to said primer layer, and e) an adhesive layer attached to said metal layer; wherein said indicia is not visible until becoming permanently visible when said facestock is separated from said release coating.
Claim 3
Dependent Claim
17 words
The labelstock of claim 1 wherein the release coating is from 100 to 300 nm in thickness.
Claim 4
Dependent Claim
22 words
The labelstock of claim 2 wherein the thickness of the primer is from 4 to 6 times that of the release coating.
Claim 5
Dependent Claim
12 words
The labelstock of claim 1 wherein the release coating comprises polyvinyl alcohol.
Claim 6
Dependent Claim
15 words
The labelstock of claim 1 wherein said metal layer has been applied by vapor deposition.
Claim 7
Dependent Claim
17 words
The labelstock of claim 5 wherein said metal layer is from 10 to 25 nm in thickness.
Claim 8
Dependent Claim
11 words
The labelstock of claim 6 wherein said metal layer is aluminum.
Claim 9
Dependent Claim
18 words
The labelstock as defined in claim 1 wherein a removable release liner is attached to said adhesive layer.
Claim 10
Dependent Claim
108 words
Labelstock comprising a) a transparent facestock having a first major surface free from any printed material and a second major surface parallel to said first major surface, b) a transparent release coating on said second major surface in the form of an intermittent layer so as to provide indicia thereon, c) a transparent primer over both said intermittent layer of said release coating and said second major surface, d) a frangible, visible metal layer over said primer layer, and e) an adhesive layer over said metal layer; wherein said indicia are not visible until said facestock is separated from said release coating whereupon said indicia become permanently visible.
Claim 11
Dependent Claim
108 words
Labelstock comprising a) a transparent facestock having a first major surface free from any printed material and a second major surface parallel to said first major surface, b) a transparent release coating on said second major surface in the form of an intermittent layer so as to provide indicia thereon, c) a transparent primer over both said intermittent layer of said release coating and said second major surface, d) a frangible, visible metal layer over said primer layer, and e) an adhesive layer over said metal layer; wherein said indicia are not visible until said facestock is separated from said release coating whereupon said indicia become permanently visible.
Claim 12
Dependent Claim
30 words
Labelstock according to claim 9 wherein the adhesion of said release coating to said second major surface is less than the adhesion of said release coating to said primer layer.
Claim 13
Dependent Claim
98 words
Labelstock comprising a multiple layer construction free from external warning graphics comprising, in order, the following: a) a transparent polymeric film, b) a transparent release coating in a pattern on said polymeric film applied so as to provide a hidden message to said labelstock, c) a continuous layer of a primer over said release coating and said polymeric film, d) a frangible metal layer over said layer of primer, and e) a layer of adhesive over said frangible metal layer; wherein said hidden message becomes permanently visible when said polymeric film is separated from said transparent release coating.
Claim 14
Dependent Claim
98 words
Labelstock comprising a multiple layer construction free from external warning graphics comprising, in order, the following: a) a transparent polymeric film, b) a transparent release coating in a pattern on said polymeric film applied so as to provide a hidden message to said labelstock, c) a continuous layer of a primer over said release coating and said polymeric film, d) a frangible metal layer over said layer of primer, and e) a layer of adhesive over said frangible metal layer; wherein said hidden message becomes permanently visible when said polymeric film is separated from said transparent release coating.
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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) | 1995-10-06 | 1996-04-06 | 1996-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-06 | 2000-04-06 | 2000-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-06 | 2004-04-06 | 2004-10-06 | $7700.00 | Window Closed / Lapsed |