US3828612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for indicating temperature variations in a product, preferably a food product
Assignee: Individual
•
Filing: 1972-04-24
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Granted: 1974-08-13
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Expires: 1992-04-24
Abstract
Abstract A method for indicating whether a product such as foodstuffs, biological preparations or the like have been subjected to conditions that would have resulted in a substantial deterioration or at least in a defective in quality of the product by means of an indicating system resulting in a permanent visible indication after a predetermined temperature level has been attained. Said indicating system comprising at least one component which is solid at the intended storage temperature and a dissolving agent for said solid component, whereby said component is partially or completely dissolved in said solvent when the system during a predetermined period of time has been subjected to a temperature exceeding the storage temperature, thereby resulting in a non-reversible visable indication.
Inventors
- 👤 R Kyrkbyn
- 👤 S Wahlgren
- 👤 C Mangen
- 👤 K Eriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:27
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
20 words
The method according to claim 1, wherein said system is applied to the product or in a storage space therefor.
Claim 2
Dependent Claim
21 words
The method according to claim 1, wherein the accessibility of the solid component is controlled by means of a surface treatment.
Claim 3
Dependent Claim
29 words
The method according to claim 1, wherein the solid component is embedded in a carrier which controls the accessibility of the solid component to the action of the solvent.
Claim 4
Dependent Claim
25 words
The method according to claim 1, wherein the indication sequence of said system is controlled by regulating the viscosity or surface tension of the solvent.
Claim 5
Dependent Claim
143 words
A composition for visual determining the extent of a temperature rise above a predetermined maximum temperature comprising at least one component which is solid below said maximum temperature, a dissolving agent for said component which is maintained inactive at said maximum temperature, said dissolving agent being irreversibly rendered active in proportion to the length of time said system is subjected to a temperature above said maximum temperature, means for controlling the amount of said solid component accessible over a period of time to said dissolving agent above said maximum temperature to regulate the rate of dissolution of said solid component and an indicator activated in proportion to the amount of dissolved solid component, whereby the actual dissolution of said component within said dissolving agent results in an indication of the length of time said composition is maintained at a temperature above said maximum.
Claim 6
Dependent Claim
48 words
The composition according to claim 6 including a color indicator disposed in the presence of said at least one component and said dissolving agent and operative to be entrapped in the resultant liquid mass formed between by the dissolution thereof when said temperature increases above said pre-set maximum.
Claim 7
Dependent Claim
18 words
The composition as defined in claim 6 wherein the indicator is disposed In said at least one component.
Claim 8
Dependent Claim
16 words
The composition as defined in claim 6 wherein said indicator is admixed with said dissolving agent.
Claim 9
Dependent Claim
33 words
An indicating agent as defined in claim 6 wherein said means for controlling the accessibility of said one component comprises a carrier and said at least one component is embedded in said carrier.
Claim 10
Dependent Claim
22 words
The composition as defined in claim 10 wherein said carrier is operative to delay the dissolution of said at least one component.
Claim 11
Dependent Claim
32 words
The composition as defined in claim 6 wherein said at least one component is pre-treated with a surface active agent to provide said means for controlling the accessibility to said one component.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |