Keybutton Image Projection Machine
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
United Kingdom Patent Specification No. 1,521,435 discloses a process for forming characters on keybuttons. The surface of each button is initially coated with a layer of radiation-sensitive material and then exposed to radiation which includes an image of the character to be formed on the surface of the button. A latent image of the character is thereby formed in the radiation-sensitive material which is subsequently developed so as to provide a visible reproduction of the character on the surface of the keybutton. The surface of the button is subsequently coated with a layer of a protective transparent material.