US4180929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tamper indicating label
Assignee: 3M Co
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Filing: 1978-01-23
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Granted: 1980-01-01
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Expires: 1998-01-23
Abstract
Abstract Tamper indicating label having strong protective film applied to a relatively fragile base film having adhesive on the opposite side. Sets of indicia and masking layers are printed on the label base with inks of differing adhesivity and overlain by a layer of clear polymeric material such as an ink residue having relatively low adhesivity to the label base but good adhesivity to the masking layers.
Inventors
- 👤 Thomas E. Schultz, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:08
CPC Classifications
G; G09; G09F; G09F3/00; G09F3/02; G09F3/0291; G09F3/0292; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10S428/915
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
212 words
A laminate especially suited as a tamper indicating label consisting essentially of (a) first and second polymeric plies, said first polymeric ply being substantially transparent and having a tensile strength at least 40% greater than said second polymeric ply, (b) first and second tacky and cohesive pressure sensitive adhesive layers, (c) first and second sets of indicia printed on said second polymeric ply, (d) masking coating over said first set of indicia but not over said second set of indicia and (e) a transparent or tinted polymeric coating over said masking coating, said second set of indicia and said second polymeric ply, said polymeric coating having low adhesivity to said first pressure sensitive adhesive layer, said second set of indicia and one of said masking coating and said first set of indicia having substantially greater adhesivity to said second polymeric ply than the other of said masking coating and said first set of indicia whereby before tampering said second set of indicia is fully visible and said first set of indicia is not visible when said laminate is adhesively attached to a substrate by said second pressure sensitive adhesive layer and tampering reveals said second polymeric ply bearing fully visible both said first set of indicia and said second set of indicia.
Claim 2
Dependent Claim
212 words
A laminate especially suited as a tamper indicating label consisting essentially of (a) first and second polymeric plies, said first polymeric ply being substantially transparent and having a tensile strength at least 40% greater than said second polymeric ply, (b) first and second tacky and cohesive pressure sensitive adhesive layers, (c) first and second sets of indicia printed on said second polymeric ply, (d) masking coating over said first set of indicia but not over said second set of indicia and (e) a transparent or tinted polymeric coating over said masking coating, said second set of indicia and said second polymeric ply, said polymeric coating having low adhesivity to said first pressure sensitive adhesive layer, said second set of indicia and one of said masking coating and said first set of indicia having substantially greater adhesivity to said second polymeric ply than the other of said masking coating and said first set of indicia whereby before tampering said second set of indicia is fully visible and said first set of indicia is not visible when said laminate is adhesively attached to a substrate by said second pressure sensitive adhesive layer and tampering reveals said second polymeric ply bearing fully visible both said first set of indicia and said second set of indicia.
Claim 3
Dependent Claim
29 words
A laminate according to claim 1 wherein the first set of indicia have substantially greater adhesivity to the second polymeric ply than the adhesivity of the masking coating thereto.
Claim 4
Dependent Claim
29 words
A laminate according to claim 1 wherein the first set of indicia have sustantially less adhesivity to the second polymeric ply than the adhesivity of the masking coating thereto.
Claim 5
Dependent Claim
20 words
A laminate according to claim 1 wherein the second polymeric ply has a thickness of 12 microns to 50 microns.
Claim 6
Dependent Claim
20 words
A laminate according to claim 1 wherein the first polymeric ply has a thickness of 12 microns to 50 microns.
Claim 7
Dependent Claim
30 words
A laminate according to claim 1 wherein a removable polysiloxane coated paper or plastic as release liner is adhered to the second pressure sensitive adhesive opposite the second polymeric ply.
Claim 8
Dependent Claim
33 words
A laminate according to claim 1 wherein the masking coating covering the first set of indicia covers a surface area less than 50% of the total surface area of the second polymeric ply.
Claim 9
Dependent Claim
20 words
A laminate according to claim 1 wherein the first and second pressure sensitive adhesives are polymerized primarily from acrylate esters.
Claim 10
Dependent Claim
16 words
A laminate according to claim 1 wherein the first polymeric ply is of oriented polyethylene terephthalate.
Claim 11
Dependent Claim
20 words
A laminate according to claim 1 wherein the second polymeric ply is of at least 75% plasticized polyvinylchloride organosol dispersion.
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) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |