US4064872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature measuring device of a liquid crystal laminate
Assignee: MEDICAL INDICATORS
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Filing: 1976-09-02
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Granted: 1977-12-27
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Expires: 1996-09-02
Abstract
Abstract Device for measuring temperature differentials on mammalian skin surfaces comprising separate dots of liquid crystals, sealed in a grid pattern between thin, performed, flexible films.
Inventors
- 👤 Sandor Caplan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:45
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/12; G01K11/16; G01K11/165; B; B41; B41M; B41M5/00; B41M5/26; B41M5/28; B41M5/281; C; C09; C09K; C09K2323/00; C09K2323/05; C09K2323/057; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/23; Y10T428/234; Y10T428/24; Y10T428/24628; Y10T428/24661; Y10T428/24669; Y10T428/28; Y10T428/2848; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
110 words
A temperature measuring device of high sensitivity and stability comprising a plurality of separate dots of liquid crystals which change color in a selected temperature range, sandwiched between two thin preformed, self-supporting films of heat sealable sheet material containing up to 500 mg per ream of monomeric components of solvents which are reactive with or soluble in the liquid crystal, a bottom opaque film and a top polymer film through which the color changes in the liquid crystals can be observed, the two films being sealed together in a grid pattern along narrow seal lines to form a multiplicity of separate cells, each cell containing a dot of liquid crystal.
Claim 2
Dependent Claim
110 words
A temperature measuring device of high sensitivity and stability comprising a plurality of separate dots of liquid crystals which change color in a selected temperature range, sandwiched between two thin preformed, self-supporting films of heat sealable sheet material containing up to 500 mg per ream of monomeric components of solvents which are reactive with or soluble in the liquid crystal, a bottom opaque film and a top polymer film through which the color changes in the liquid crystals can be observed, the two films being sealed together in a grid pattern along narrow seal lines to form a multiplicity of separate cells, each cell containing a dot of liquid crystal.
Claim 3
Dependent Claim
12 words
A device of claim 1 in which the cells are square shaped.
Claim 4
Dependent Claim
14 words
A device of claim 1 in which the seal lines are heat seal lines.
Claim 5
Dependent Claim
26 words
A device of claim 1 in which the liquid crystals comprise a mixture of 46% by weight oleyl cholesteryl carbonate and 54% by weight cholesteryl nonanoate.
Claim 6
Dependent Claim
26 words
A device of claim 1 in which the liquid crystals comprise a mixture of 49% by weight oleyl cholesteryl carbonate and 51% by weight cholesteryl nonanoate.
Claim 7
Dependent Claim
22 words
A device of claim 1 in which the liquid crystals comprise a mixture of 52% oleyl cholesteryl carbonate and 48% cholesteryl nonanoate.
Claim 8
Dependent Claim
26 words
A device of claim 1 containing up to 50 mg per ream of components which are reactive with respect to or soluble in the liquid crystal.
Claim 9
Dependent Claim
25 words
A device of claim 1 wherein the top and bottom films each comprise polyethylene terephthalate coated on the inner surface with heat sealable polyvinylidene chloride.
Claim 10
Dependent Claim
25 words
A device of claim 1 wherein the top and bottom films each comprise polyethylene terephthalate coated on the inner surface with heat sealable polyvinyl chloride.
Claim 11
Dependent Claim
20 words
A device of claim 1 in which the bottom film comprises polypropylene laminated on its interior surface with aluminum foil.
Claim 12
Dependent Claim
20 words
A device of claim 1 in which the bottom film is coated on its outer surface with pressure sensitive adhesive.
Claim 13
Dependent Claim
14 words
A device of claim 1 containing from 40 to 400 cells per square inch.
Claim 14
Dependent Claim
11 words
A device of claim 2 containing 100 cells per square inch.
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) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |