Patent US4390017A successfully refreshed from Google Patents.
US4154107A
Expired / Lapsed
US
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Time temperature indicating device
Assignee: PY MAH Corp
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Filing: 1978-03-07
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Granted: 1979-05-15
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Expires: 1998-03-07
Abstract
Abstract There is provided a time temperature device having an indicator layer which visually indicates the lapse of a time temperature integral. A signaling component is provided which, upon contact with the indicating layer, causes the indicator layer to undergo a visually perceptive change. The device further includes a reservoir for the signaling component, including a first backing and adhesive layer containing an adhesive substance. The adhesive layer is positioned between the indicating layer and the first backing.
Inventors
- 👤 Egenius A. Giezen
- 👤 Cornelis A. M. Hoefs
- 👤 Abram Opschoor
- 👤 Eduard M. Verhulst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:42
CPC Classifications
G; G01; G01K; G01K3/00; G01K3/02; G01K3/04; G01K11/00; G01K11/12; G01K11/16
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
100 words
A time-temperature indicating device for visually indicating the passage of a certain time-temperature interval, characterized in that it comprises (a) an indicator layer which visually indicates the lapse of a time-temperature interval; (b) a signaling component which upon contact with the indicator layer causes the latter to undergo a visually perceptible change; and (c) a reservoir for the signaling component, which reservoir comprises a first backing and an adhesive layer containing a pressure sensitive adhesive substance, which adhesive layer is positioned between the indicator layer and the first backing; said signaling component is dissolved in the pressure sensitive adhesive substance.
Claim 2
Dependent Claim
100 words
A time-temperature indicating device for visually indicating the passage of a certain time-temperature interval, characterized in that it comprises (a) an indicator layer which visually indicates the lapse of a time-temperature interval; (b) a signaling component which upon contact with the indicator layer causes the latter to undergo a visually perceptible change; and (c) a reservoir for the signaling component, which reservoir comprises a first backing and an adhesive layer containing a pressure sensitive adhesive substance, which adhesive layer is positioned between the indicator layer and the first backing; said signaling component is dissolved in the pressure sensitive adhesive substance.
Claim 3
Dependent Claim
30 words
A time-temperature indicating device according to claim 1 characterized in that the adhesive substance is a self-hardening pressure-sensitive adhesive substance having a basis of acryl, dissolved in methyl ethyl ketone.
Claim 4
Dependent Claim
21 words
A time-temperature indicating device according to claim 2, characterized in that the pressure-sensitive adhesive substance has a basis of polybutyl acrylate.
Claim 5
Dependent Claim
54 words
A time-temperature indicating device according to claim 1, characterized in that the indicator layer contains an acid-base indicator, and the component soluble in the adhesive substance is a reagent having an acidity which deviates from pH=7, which reagent brings about a change of color of the acid-base indicator upon coming into contact with same.
Claim 6
Dependent Claim
16 words
A time-temperature indicating device according to claim 4, characterized in that the reagent is an acid.
Claim 7
Dependent Claim
16 words
A time-temperature indicating device according to claim 4, characterized in that the acid is maleic acid.
Claim 8
Dependent Claim
30 words
A time-temperature indicating device according to claim 4, characterized in that the acid is selected from the group consisting of para-toluene sulphonic acid, naphthalene sulphonic acid and camphor sulphonic acid.
Claim 9
Dependent Claim
50 words
A time temperature indicating device according to claim 4, characterized in that the indicator layer contains absorbent paper which includes the acid-base indicator and a wetting agent, and the wetting agent retains water in a sufficient amount to cause the reaction between the reagent and the indicator to take place.
Claim 10
Dependent Claim
19 words
A time-temperature indicating device according to claim 8, characterized in that the paper is substantially free from hydrophobic substances.
Claim 11
Dependent Claim
22 words
A time-temperature indicating device according to claim 8, characterized in that the color change range of the acid-base indicator is below ph=7.
Claim 12
Dependent Claim
17 words
A time-temperature indicating device according to claim 10, characterized in that the acid-base indicator is bromophenol blue.
Claim 13
Dependent Claim
16 words
A time-temperature indicating device according to claim 8, characterized in that the wetting agent is hygroscopic.
Claim 14
Dependent Claim
22 words
A time-temperature indicating device according to claim 8, characterized in that the wetting agent contains salts capable of binding water of crystallization.
Claim 15
Dependent Claim
24 words
A time-temperature indicating device according to claim 13, characterized in that the salts are from the group consisting of lithium chloride and magnesium chloride.
Claim 16
Dependent Claim
22 words
A time-temperature indicating device according to claim 14, characterized in that the wetting agent contains MgCl 2 .6H 2 O and glycerol.
Claim 17
Dependent Claim
26 words
A time-temperature indicating device according to claim 8, characterized in that the wetting agent is an anti-freeze, whereby said device may be used at freezing temperatures.
Claim 18
Dependent Claim
17 words
A time-temperature indicating device according to claim 8, characterized in that the indicator layer contains a base.
Claim 19
Dependent Claim
15 words
A time-temperature indicating device according to claim 17, characterized in that the base is trihydroxyethylamine.
Claim 20
Dependent Claim
27 words
A time-temperature indicating device according to claim 1, characterized in that the adhesive layer on the first backing is placed in direct contact with the indicator layer.
Claim 21
Dependent Claim
28 words
A time-temperature indicating device according to claim 1, characterized in that between the adhesive layer on the first backing and the indicator layer there is a diffusion film.
Claim 22
Dependent Claim
55 words
A time-temperature indicating device according to claim 4, characterized in that there is provided a second backing to which there is applied an adhesive layer containing a pressure-sensitive adhesive substance, which adhesive layer faces the adhesive layer on the first backing and the acid-base indicator is contained in the adhesive layer of the second backing.
Claim 23
Dependent Claim
22 words
A time-temperature indicating device according to claim 21, characterized in that the color change range of the acid-base indicator is below pH=7.
Claim 24
Dependent Claim
40 words
A time-temperature indicating device according to claim 22, characterized in that the acid-base indicator is selected from the group consisting of methyl violet, cresol red, crystal violet, metanil yellow, tropeolin oo, benzyl orange, butter yellow (dimethyl yellow) and methyl red.
Claim 25
Dependent Claim
17 words
A time-temperature indicating device according to claim 23, characterized in that the acid-base indicator is butter yellow.
Claim 26
Dependent Claim
30 words
A time-temperature indicating device according to claim 21, characterized in that the adhesive layer on the second backing is in direct contact with the adhesive layer on the first backing.
Claim 27
Dependent Claim
27 words
A time-temperature indicating device according to claim 21, characterized in that between the adhesive layers of the first and the second backing there is a diffusion film.
Claim 28
Dependent Claim
43 words
A time-temperature indicating device according to claim 1, characterized in that the component signaling soluble in the adhesive substance is iodine, and the indicator layer contains absorbent paper which includes starch and a wetting agent in which wetting agent the iodine is soluble.
Claim 29
Dependent Claim
26 words
A time-temperature indicating device according to claim 27, characterized in that the adhesive layer on the first backing is in immediate contact with the indicator layer.
Claim 30
Dependent Claim
28 words
A time-temperature indicating device according to claim 27, characterized in that between the indicator layer and the adhesive layer on the first backing there is a diffusion film.
Claim 31
Dependent Claim
69 words
A time-temperature indicating device according to claim 1, characterized in that the component soluble in the adhesive substance applied to the first backing is a coloring agent, and there is provided a second, transparent backing to which there is applied an adhesive layer containing a pressure-sensitive adhesive substance, which adhesive layer faces the adhesive layer on the first backing and is intransparent for the color of the coloring agent.
Claim 32
Dependent Claim
23 words
A time-temperature indicating device according to claim 30, characterized in that the adhesive layer applied to the second backing contains a delustring agent.
Claim 33
Dependent Claim
17 words
A time-temperature indicating device according to claim 31, characterized in that the delustring agent is titanium dioxide.
Claim 34
Dependent Claim
31 words
A time-temperature indicating device according to claim 30, characterized in that the adhesive layer on the second backing is positioned in direct contact with the adhesive layer on the first backing.
Claim 35
Dependent Claim
28 words
A time-temperature indicating device according to claim 30, characterized in that between the adhesive layers of the first and the second backing there is positioned a diffusion film.
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) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |