US2850393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frozen food telltale
Assignee: Aseptic Thermo Indicator Co
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Filing: 1956-07-23
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Granted: 1958-09-02
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Expires: 1976-07-23
Abstract
No abstract record available.
Inventors
- 👤 Vincent A Romito
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; G01N31/229; B; B65; B65D; B65D79/00; B65D79/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
A TELLTALE DEVICE FOR A REFRIGERATED PACKAGE COMPRISING A WATER ABSORBENT BASE MEMBER HAVING A PH INDICATOR SUBSTANCE ON AT LEAST A VISIBLE FRONT SURFACE THEREOF; A MASS OF SEMI-SOLID PASTE IN CONTACT WITH SAID BASE MEMBER ON THE BACK SURFACE THEREOF, SAID PASTE CONSISTING ESSENTIALLY OF AN AQUEOUS LIQUID DISPERSED AS A STABLE EMULSION IN AN OIL BY MEANS OF AN EMULSIFYING AGENT, SAID OIL BEING THE EXTERNAL PHASE, SAID EMULSION BEING CHARACTERIZED BY BEING BROKEN WHEN SUBJECTED TO THE SOLIDIFICATION TEMPERATURE OF SAID AQUEOUS LIQUID FOLLOWED BY THE THAWING OF SAID EMULSION, SAID AQUEOUS LIWUID BEING SELECTED AS TO PH TO BE EFFECTIVE TO CHANGE THE COLOR OF SAID PH INDICATOR WHEN SAID AQUEOUS LIQUID HAS BEEN INITIALLY FROZEN IN SAID EMULSION AND SUBSEQUENTLY THAWED TO A LIQUID STATE FROM THE BROKEN EMULSION PHASE; AND A WATER- AND OIL-PROOF ENCLOSURE FOR SAID BASE MEMBER AND SAID PASTE MASS, SAID ENCLOSURE BEING TRANSPARENT ADJACENT SAID FRONT SURFACE OF SAID BASE, WHEREBY A COLOR CHANGE IN SAID PH INDICATOR SUBSTANCE MAY BE OBSERVED FOLLOWING THE ABSORPTION OF LIQUID AQUEOUS SOLUTION INTO SAID BASE.
Claim 2
Dependent Claim
183 words
A TELLTALE DEVICE FOR A REFRIGERATED PACKAGE COMPRISING A WATER ABSORBENT BASE MEMBER HAVING A PH INDICATOR SUBSTANCE ON AT LEAST A VISIBLE FRONT SURFACE THEREOF; A MASS OF SEMI-SOLID PASTE IN CONTACT WITH SAID BASE MEMBER ON THE BACK SURFACE THEREOF, SAID PASTE CONSISTING ESSENTIALLY OF AN AQUEOUS LIQUID DISPERSED AS A STABLE EMULSION IN AN OIL BY MEANS OF AN EMULSIFYING AGENT, SAID OIL BEING THE EXTERNAL PHASE, SAID EMULSION BEING CHARACTERIZED BY BEING BROKEN WHEN SUBJECTED TO THE SOLIDIFICATION TEMPERATURE OF SAID AQUEOUS LIQUID FOLLOWED BY THE THAWING OF SAID EMULSION, SAID AQUEOUS LIWUID BEING SELECTED AS TO PH TO BE EFFECTIVE TO CHANGE THE COLOR OF SAID PH INDICATOR WHEN SAID AQUEOUS LIQUID HAS BEEN INITIALLY FROZEN IN SAID EMULSION AND SUBSEQUENTLY THAWED TO A LIQUID STATE FROM THE BROKEN EMULSION PHASE; AND A WATER- AND OIL-PROOF ENCLOSURE FOR SAID BASE MEMBER AND SAID PASTE MASS, SAID ENCLOSURE BEING TRANSPARENT ADJACENT SAID FRONT SURFACE OF SAID BASE, WHEREBY A COLOR CHANGE IN SAID PH INDICATOR SUBSTANCE MAY BE OBSERVED FOLLOWING THE ABSORPTION OF LIQUID AQUEOUS SOLUTION INTO SAID BASE.
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) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |