Compositions – Liquid crystal compositions – Cholesteric liquid crystal composition containing a sterol...
Patent
1986-03-21
1989-08-22
Maples, John S.
Compositions
Liquid crystal compositions
Cholesteric liquid crystal composition containing a sterol...
2524081, 374106, 374162, C09K 1936, G01K 1112
Patent
active
048593605
ABSTRACT:
Described are cholesteric liquid crystal formulations suitable for use as indicators of time and/or temperature, and methods for reliably characterizing and reproducing initial and subsequent batches of such cholesteric liquid crystal formulations. The formulations have a time-dependent, temperature-dependent limit in a pseudo-irreversible liquid crystal phase wherein when said limit is exceeded, the formulations exhibit a color change which is irreversible by cooling.
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Marion Scientific, "Is the Temperature of This Blood . . . ?", brochure, 1/20/1984.
Dobberstein Robert H.
Mead Sharon M.
Suzuki Fred K.
Yoshida Noble H.
Biosynergy, Inc.
Maples John S.
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