US4212153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time color indicator
Assignee: Note Worthy Products Inc
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Filing: 1978-02-07
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Granted: 1980-07-15
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Expires: 1998-02-07
Abstract
Abstract A laminated indicator which changes in a visually perceptible mode with the passage of time and a method for making such an indicator. At least two layers are provided whereby the molecular migration of an agent in an interior layer to the outermost surface of the exterior layer causes a change which can be visually percepted, e.g., a change in color or shade. Preferred embodiments include the migration of a dye or the migration of an acid or base wherein the outermost layer has the other member of an acid-base pair and a pH indicator.
Inventors
- 👤 Agis F. Kydonieus
- 👤 Inja K. Smith
- 👤 Reid A. Conroy
- 👤 Ernest A. Pedicano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:53
CPC Classifications
G; G04; G04F; G04F1/00; G01; G01K; G01K3/00; G01K3/02; G01K3/04; G04F13/00; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23929; Y10T428/28; Y10T428/2843
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
65 words
A solid, non-porous time indicator comprising a laminate which comprises (i) a solid, non-porous polymeric substrate having a first and a second surface; and (ii) a layer of a solid, non-porous polymeric composition adhered to the first surface of said substrate and containing an agent capable of migrating throughout said substrate to cause a visually perceptible change in the substrate at the second surface thereof.
Claim 2
Dependent Claim
65 words
A solid, non-porous time indicator comprising a laminate which comprises (i) a solid, non-porous polymeric substrate having a first and a second surface; and (ii) a layer of a solid, non-porous polymeric composition adhered to the first surface of said substrate and containing an agent capable of migrating throughout said substrate to cause a visually perceptible change in the substrate at the second surface thereof.
Claim 3
Dependent Claim
40 words
The time indicator of claim 1, further comprising (iii) a second solid, non-porous polymeric substrate adhered to the layer (ii) on the side opposite said substrate (i), wherein said second substrate is a barrier to the migration of said agent.
Claim 4
Dependent Claim
14 words
The time indicator of claim 2, wherein said second substrate (iii) is polyethylene terephthalate.
Claim 5
Dependent Claim
13 words
The time indicator of claim 1, wherein said substrate (i) is polyvinyl chloride.
Claim 6
Dependent Claim
18 words
The time indicator of claim 1, wherein said visually perceptible change is a change in color or shade.
Claim 7
Dependent Claim
33 words
The time indicator of claim 1, wherein said agent is an acid, said substrate (i) further comprises a base and an acid-base indicator and said visually perceptible change is a change in color.
Claim 8
Dependent Claim
33 words
The time indicator of claim 1, wherein said agent is a base, said substrate (i) further comprises an acid and an acid-base indicator and said visually perceptible change is a change in color.
Claim 9
Dependent Claim
12 words
The time indicator of claim 1, wherein said agent is a dye.
Claim 10
Dependent Claim
40 words
The time indicator of claim 2, further comprising (iv) a pressure-sensitive adhesive layer on the side of said second substrate (iii) opposite layer (ii); and (v) a release sheet on the adhesive layer (iv) on the side opposite layer (iii).
Claim 11
Independent Claim
59 words
A method of forming a time indicator comprising bringing the first surface of a solid, non-porous polymeric substrate having a first and a second surface into contact with a layer of a solid non-porous polymeric composition containing an agent capable of migrating throughout said substrate to cause a visually perceptible change in the substrate at the second surface thereof.
Claim 12
Independent Claim
59 words
A method of forming a time indicator comprising bringing the first surface of a solid, non-porous polymeric substrate having a first and a second surface into contact with a layer of a solid non-porous polymeric composition containing an agent capable of migrating throughout said substrate to cause a visually perceptible change in the substrate at the second surface thereof.
Claim 13
Dependent Claim
39 words
The method of claim 10, further comprising providing a second solid, non-porous polymeric substrate on the polymeric composition layer on the side opposite said first substrate, wherein said second substrate is a barrier to the migration of said agent.
Claim 14
Dependent Claim
12 words
The method of claim 11, wherein said second substrate is polyethylene terephthalate.
Claim 15
Dependent Claim
12 words
The method of claim 10, wherein said substrate (i) is polyvinyl chloride.
Claim 16
Dependent Claim
17 words
The method of claim 10, wherein said visually perceptible change is a change in color or shade.
Claim 17
Dependent Claim
32 words
The method of claim 10, wherein said agent is an acid, said substrate (i) further comprises a base and an acid-base indicator and said visually perceptible change is a change in color.
Claim 18
Dependent Claim
32 words
The method of claim 10, wherein said agent is a base, said substrate (i) further comprises an acid and an acid-base indicator and said visually perceptible change is a change in color.
Claim 19
Dependent Claim
11 words
The method of claim 10, wherein said agent is a dye.
Claim 20
Dependent Claim
39 words
The method of claim 11, further comprising providing a pressure-sensitive adhesive layer on the side of said second substrate opposite said polymeric composition layer and a release sheet on the adhesive layer on the side opposite the second substrate.
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) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |