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US 4,725,462 AGranted
Heat activated indica on textiles
OwnerToru Kimurainventor
Life of this patent
Estimating the term…
Abstract
A woven fabric textile (10) in the form of a washcloth (12) or other fabric article having indica (16) in the form of a hidden message or symbol imprinted on its major surface. The indica is not visible to the naked eye under normal ambient temperatures. However, when the washcloth (12) is subjected to temperatures above 108 degrees F. (42 degrees C.), such as when emersed in bath water, the hidden indica (16) appears to the user. The indica (16) consists of a blend of conventional ink and a substance known by its tradename MATSUMIN THERMOCHROMATIC COLOR.
Claims5
Textile articles with hidden indica activated by heat comprising:
- (a) a textile article of woven fabric having a major surface defining the front of the textile article as viewed by the user made from natural or man made fibers,
- (b) a design on said major surface of the article impregnating the textile with a substance having a permanent coloring agent, and
- (c) indica infused into said textile article with thermochromatic ink integral with said design hidden at normal prevailing ambient temperatures and visually appearing when subjected to external heat said thermochromatic ink comprises in combination a blend of water, gum turpentine, neutralizer, pigment-resin color, and a substance consisting of 30% organic pigment, 30 % polyacrylic ester emulsion, 30% water, 7% mineral spirits and 3% ethylene glycol, said design is characterized by an ornamental mark providing a contrast in color of said article located in such a manner as to allow said indica to convey a message when visually manifested with said indica appearing between 90 degrees F. (33 degrees C.) and 108 degrees F. (42degrees C.) and visible at temperatures thereabove.
Dependencies are inferred from the claim text.