US3822189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enzymatic time-temperature indicating methods and devices
Assignee: Food Control AB
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Filing: 1972-12-08
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Granted: 1974-07-02
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Expires: 1992-12-08
Abstract
Abstract ENZYMATIC TIME-TEMPERATURE INDICATING METHOD AND DEVICE UTILIZING AN ENZYME AND ITS SUBSTRATE WHICH REACT WITH EACH OTHER IN A REACTION ZONE TO GIVE A REACTION PRODUCT THAT IS INDICATED BY THE VISIBLE CHANGE OF AN INDICATING SUBSTANCE AND, TO ADJUST THE TIME NEEDED FOR VISIBLE CHANGE AT HIGH TEMPERATURES, A SOURCE OF SAID REACTION PRODUCT SUPPLYING AN ADDITIONAL AMOUNT OF REACTION PRODUCT TO THE REACTION ZONE IN RESPONSE TO TIME AND TEMPERATURE.
Inventors
- 👤 S Tornmarck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:42
CPC Classifications
G; G01; G01K; G01K3/00; G01K3/02; G01K3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |