US2823131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Food spoilage indicator
Assignee: Individual
•
Filing: 1954-06-17
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Granted: 1958-02-11
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Expires: 1974-06-17
Abstract
No abstract record available.
Inventors
- 👤 Bruce W Power
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:08
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/221
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A FOOD SPOILAGE DETECTING DEVICE INCLUDING AN ELEMENT ADAPTED TO CHANGE ITS COLOR UPON CONTACT WITH A GIVEN RE-AGENT, A BREAKABLE CAPSULE CONTAINING AN AQUEOUS SOLUTION OF SUCH RE-AGENT AND ASSOCIATED WITH SAID ELEMENT, MEANS ATTACHING SAID ELEMENT AND SAID CAPSULE TO A FOOD PACKAGE, WHEREBY, UPON FREEZING OF SAID FOOD PACKAGE, SAID AQUEOUS SOLUTION WILL ALSO FREEZE AND BREAK SAID CAPSULE AND WHEREBY, SUBJECTING SAID PACKAGE TO TEMPERATURE SUFFICIENT TO THAW OUT ITS CONTENTS WILL ALSO LIQUIFY SAID RE-AGENT AND ALLOW TO COME INTO CONTACT WITH, AND TO CHANGE THE COLOR, OF SAID ELEMENT, AND A WATER SOLUBLE COATING ENCLOSING SAID CAPSULE FOR DELAYING THE CONTACT OF SAID RE-AGENT FOR THE PERIOD OF TIME NECESSARY TO DISSOLVE SAID COATING AFTER THE LIQUEFICATION OF SAID REAGENT, THE COMPOSITION AND THICKNESS OF SAID COATING BEING SUCH THAT THE TIME NEEDED FOR LIQUEFICATION OF SAID COATING IS LESS THAN THE TIME NEEDED FOR SPOILAGE OF THE FOOD TO SET IN.
Claim 2
Dependent Claim
158 words
A FOOD SPOILAGE DETECTING DEVICE INCLUDING AN ELEMENT ADAPTED TO CHANGE ITS COLOR UPON CONTACT WITH A GIVEN RE-AGENT, A BREAKABLE CAPSULE CONTAINING AN AQUEOUS SOLUTION OF SUCH RE-AGENT AND ASSOCIATED WITH SAID ELEMENT, MEANS ATTACHING SAID ELEMENT AND SAID CAPSULE TO A FOOD PACKAGE, WHEREBY, UPON FREEZING OF SAID FOOD PACKAGE, SAID AQUEOUS SOLUTION WILL ALSO FREEZE AND BREAK SAID CAPSULE AND WHEREBY, SUBJECTING SAID PACKAGE TO TEMPERATURE SUFFICIENT TO THAW OUT ITS CONTENTS WILL ALSO LIQUIFY SAID RE-AGENT AND ALLOW TO COME INTO CONTACT WITH, AND TO CHANGE THE COLOR, OF SAID ELEMENT, AND A WATER SOLUBLE COATING ENCLOSING SAID CAPSULE FOR DELAYING THE CONTACT OF SAID RE-AGENT FOR THE PERIOD OF TIME NECESSARY TO DISSOLVE SAID COATING AFTER THE LIQUEFICATION OF SAID REAGENT, THE COMPOSITION AND THICKNESS OF SAID COATING BEING SUCH THAT THE TIME NEEDED FOR LIQUEFICATION OF SAID COATING IS LESS THAN THE TIME NEEDED FOR SPOILAGE OF THE FOOD TO SET IN.
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) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |