US3576761A
Expired / Lapsed
US
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Thermometric compositions comprising one mesomorphic substance, one cholesteryl halide, and an oil soluble dye selected from the group consisting of disazo, indulene, and nigrosine dyes
Assignee: Liquid Crystal Industries
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Filing: 1969-03-18
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Granted: 1971-04-27
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Expires: 1989-03-18
Abstract
Abstract NOVEL THERMOMETRIC COMPOSITION CAPABLE OF RETAINING AN INDICATION THAT THEY HAVE EXCEEDED A GIVEN TEMPERATURE, WHICH COMPOSITIONS COMPRISE A MIXTURE OF AT LEAST ONE MESOMORPHIC SUBSTANCE AND AT LEAST ONE CHOLESTERYL HALIDE, THE MIXTURE EXHIBITING COLOR IN THE CHOLESTERIC STATE AT A FIRST TEMPERATURE AND CHANGING FROM THAT STATE AT A SECOND TEMPERATURE, AND AN AMOUNT OF OIL-SOLUBLE DYE SUFFICIENT TO PREVENT THE MIXTURE FROM REVERTING TO THE COLOR OF THE CHOLESTERIC STATE WHEN THE COMPOSITIONS ARE RETURNED TO THE FIRST TEMEPRATURE; THERMOMETRIC ELEMENTS COMPRISING SUCH COMPOSITIONS; AND THERMOMETRIC ARTICLES COMPRISING SAID COMPOSITIONS.
Inventors
- 👤 Frederick Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:14
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/12; G01K11/16; B; B44; B44F; B44F1/00; G09; G09F; G09F9/00; G09F9/30; G09F9/35
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |