Digital thermometer and method of manufacture

Details Digital thermometer and method of manufacture Digital thermometer and method of manufacture

1974-10-24

1976-06-29

Swisher, S. Clement

Measuring and testing

Gas analysis

Moisture content or vapor pressure

350160LC, G01K 1116

Patent

active

039657426

ABSTRACT:
A non-breakable digital thermometer and a method for its manufacture are provided. The thermometer comprises a plastic strip, either flexible or rigid, of microencapsulated temperature responsive liquid crystal material in a lateral array of numerical indicia, each index having associated with it liquid crystals having a temperature responsive range relevant to the numerical value of the index. Overlap of temperature responsive ranges is provided to insure at least one visible indicia, when the temperature being measured is within the range of interest.
A substantially continuous sheet of an inert transparent base is sequentially printed with a darkly pigmented mask defining transparent indicia areas. Different liquid crystal composition slurries are coated in a continuous stripe over the appropriate indicia, with adjacent compositions allowed to mix at the edges, before rapid partial drying prevents additional mixing. The compositions are then dried substantially completely, and coated with a darkly pigmented coating. Individual strips are then cut transverse to the direction of movement of the film so as to provide individual digital thermometers.

REFERENCES:
patent: 1676536 (1928-07-01), Ferkel
patent: 3440882 (1969-04-01), Jones
patent: 3661142 (1972-05-01), Flam
patent: 3861213 (1975-01-01), Parker

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