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:
Jun. 29, 1976
Filed:
Oct. 24, 1974
Robert Parker, Danville, CA (US);
RPR, Inc., Dublin, CA (US);
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.