US4051804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thaw-indicator device
Assignee: GARNETT MCKEEN CHEMICAL CORP
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Filing: 1976-03-01
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Granted: 1977-10-04
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Expires: 1996-03-01
Abstract
Abstract Thaw-indicator for frozen articles including a V-shaped transparent elastomeric tube having its inner wall surfaces disposed in liquid tight interfacial engagement at the apex of the V by a removable band and defining a pair of closed liquid containers, adapted to contain freezable contrasting liquid dyes.
Inventors
- 👤 Merrill Garnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:56
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/12; G01K11/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
An improved thaw-indicating device for frozen articles comprising an elongate transparent elastomeric tube folded into a V shaped to define first and second discrete closed end liquid containers separated by liquid tight interfacial engagement of the interior tube wall surfaces at the apex of the V, first and second liquid dyes for producing a contrasting color upon intermixture thereof selectively contained in said first and second closed end containers and means for selectively maintaining said liquid tight interfacial tube wall surface engagement temporarily at the apex of the V.
Claim 2
Dependent Claim
89 words
An improved thaw-indicating device for frozen articles comprising an elongate transparent elastomeric tube folded into a V shaped to define first and second discrete closed end liquid containers separated by liquid tight interfacial engagement of the interior tube wall surfaces at the apex of the V, first and second liquid dyes for producing a contrasting color upon intermixture thereof selectively contained in said first and second closed end containers and means for selectively maintaining said liquid tight interfacial tube wall surface engagement temporarily at the apex of the V.
Claim 3
Dependent Claim
17 words
An improved thaw-indicator device, as set forth in claim 1, wherein the elastomeric tube comprises polyvinyl tubing.
Claim 4
Dependent Claim
44 words
An improved thaw-indicating device, as set forth in claim 1, wherein said means for maintaining said liquid tight interfacial tube wall engagement at the apex of the V comprises a band sized to encircle the folded tube and maintain the folded V shape thereof.
Claim 5
Dependent Claim
15 words
An improved thaw-indicating device, as set forth in claim 3, wherein said band is removable.
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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |