.~ With chemically reactive treatment of glass preform {4}
30.11
.~.~ To enhance the ability to darken or change color in response to radiation exposure (e.g., photochromic)
DEFINITION
Classification: 65/30.11
To enhance the ability to darken or change color in response to radiation exposure (e.g., photochromic):
(under subclass 30.1) Processes wherein the chemically reactive treatment is for the purpose of enhancing the photochromic property of the glass or to render the glass photochromic.
(1) Note. "Photochromic" refers to the ability of a glass to reversibly change color, darken, and fade on exposure to the presence and removal of electromagnetic radiation.
(2) Note. Included herein are processes which effect parallel alignment of crystallites of a colorant substance, but in which there is insufficient crystal formation to actually effect a coloration or darkening without the further step of exposure to electromagnetic radiation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
30.13, for processes of imparting color to glass by an ion exchange process.
33.1, for processes of devitrifying glass or vitrifying crystallized glass.
SEE OR SEARCH CLASS 430, Radiation Imagery Chemistry: Process, Composition, or Product Thereof,
13, for products comprising an image contained within a transparent base, which may have been partially prepared by a process classified in Class 65, Glass Manufacturing, subclass 30.11; subclass 351 for thermos:graphic processes of preparing a colored image involving applying heat to develop the image, following the imaging step; and subclasses 353+ for thermos:graphic processes of developing an image involving applying heat to develop the image during dry development thereof, following the imaging step.
501, Compositions: Ceramic,
2+, for devitrified glass-ceramic compositions and processes of making them; and subclass 13 for photochromic glass compositions and processes for their manufacture.
