The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 1979
Filed:
Dec. 05, 1977
Julius A Lindquist, Bridgewater, NJ (US);
Johnson & Johnson, New Brunswick, NJ (US);
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.