Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1977-12-05
1979-04-24
Queisser, Richard C.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
116207, 252408, 116217, G01K 1116
Patent
active
041505727
ABSTRACT:
A thermometer including a heat sensitive material which undergoes a reversible visible change from a crystalline solid to a viscous mass at a predetermined temperature, said heat sensitive material comprising an individual or mixture of low molecular weight organic compounds and a polymer, said polymer being present in said mixture in an amount, effective to retard the crystallization of said organic compound between temperatures of from about room temperature to said predetermined temperature. Preferably a plurality of discreet heat sensitive materials each of which undergoes a visible change at a different predetermined temperature are supported on either a flat sheet or round cylinder which may be a dark transparent filter material. The heat sensitive materials are covered by a light transparent filter material which is preferably yellow. In the most preferred embodiment of the instant invention, said heat sensitive materials are contained in the compartments above perforations of a perforated sheet. Both the heat sensitive material and said perforated sheet may be the same color.
REFERENCES:
patent: 3175401 (1965-03-01), Geldmacher
patent: 3440882 (1969-04-01), Jones
patent: 3465590 (1969-09-01), Kluth et al.
patent: 3665770 (1972-05-01), Sagi et al.
patent: 3920574 (1975-11-01), Brown, Jr. et al.
patent: 3956153 (1976-05-01), Chadha
patent: 3974317 (1976-08-01), Sharpless
patent: 3975288 (1976-08-01), Davis
patent: 3980581 (1976-09-01), Godsey, Jr. et al.
patent: 4028944 (1977-06-01), Erb
Johnson & Johnson
Queisser Richard C.
Roskos Joseph W.
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