US 4,044,614 A · Thermometer

Abstract

An improved thermometer which includes a total enclosure composed of a pair of coatings covering the stem portion and the bulb portion of the thermometer. A substantially transparent plastic material covering the stem portion of the improved thermometer has an index of refraction which is sufficiently high to allow a user to visually interpret the location of an internally contained heat expandable substance in relation to indicia formed on the stem portion. The bulb section of the improved thermometer is enclosed by a second thermally conductive layer. Both the first and seconds layers are joined to form a total enclosure for the thermometer throughout the extended length of both the bulb and the stem portions. Additionally, an increased amount of substantially transparent plastic material is added to the terminal end of the stem portion of the improved thermometer in order to provide a cushioning effect under dynamic loads when the thermometer inadvertently falls to an external surface.

Claims12

Dependent claims

A thermometer having a bulb portion and a stem portion comprising:

a. a first layer member enclosing said stem portion of said thermometer, said first layer having an index of refraction sufficiently high to provide visual interpretation of the positional location of an internally contained heat expandable substance in relation to indicia formed on said stem portion, and,
b. a second thermally conductive silicone rubber layer member enclosing said bulb portion of said thermometer, said second layer member being separate and distinct from said first layer member, said first and second layers being joined to form closed contour enclosure for said thermometer throughout an extended length of said thermometer, said first and second layer members being secured to said stem and bulb portion and each of the other for providing contiguous contact of said layers with an outer surface of said thermometer throughout said extended length of said thermometer, said first and second layer member being non-removably secured to said outer surface of said thermometer.

Dependencies are inferred from the claim text.

Thermometer

Life of this patent

Thermometer

Life of this patent

Abstract

Claims12