US4045383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable emulsions and improved temperature monitoring films prepared therefrom
Assignee: Hoffmann La Roche Inc
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Filing: 1976-01-21
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Granted: 1977-08-30
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Expires: 1996-01-21
Abstract
Abstract Improved temperature monitoring films formed from stable emulsions containing compounds capable of existing in the cholesteric liquid crystalline phase which are protected and stabilized against aging, and the atmosphere by the inclusion of an antioxidant are provided. The thus-formed film materials are used in thermography and/or thermometry.
Inventors
- 👤 Arnold Koff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:44
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/12; G01K11/16; G01K11/165; C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31768; Y10T428/31801
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
84 words
A device suitable for forming thermographic patterns consisting of a film having, as an integral part thereof, from about 25% to about 75% by weight on a dry weight basis of a cholesteric liquid crystal composition containing from about 0.2% to about 1.75% by weight based on the weight of the cholesteric liquid crystals of butylated hydroxytoluene and from about 75% to about 25% by weight on dry weight basis, of gelatin and wherein the cholesteric liquid crystals are homogeneously distributed throughout the film.
Claim 2
Independent Claim
84 words
A device suitable for forming thermographic patterns consisting of a film having, as an integral part thereof, from about 25% to about 75% by weight on a dry weight basis of a cholesteric liquid crystal composition containing from about 0.2% to about 1.75% by weight based on the weight of the cholesteric liquid crystals of butylated hydroxytoluene and from about 75% to about 25% by weight on dry weight basis, of gelatin and wherein the cholesteric liquid crystals are homogeneously distributed throughout the film.
Claim 3
Dependent Claim
14 words
The device of claim 1 wherein said film is adhered to a supportive matrix.
Claim 4
Dependent Claim
28 words
A device as in claim 1 wherein the concentration of gelatin in the film is from about 35% to about 60% by weight on a dry weight basis.
References Cited (Backward Citations)
GB1138590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |