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Class Information
Number: 204/901
Name: Chemistry: electrical and wave energy > Effecting a color change by wave energy
Description: Subject matter involving a process of effecting a color change in a material through the use of wave energy.

Patents under this class:

Patent Number Title Of Patent Date Issued
6696587 Process for treating aminosilane discolorations Feb. 24, 2004
5994579 Process for lightening the color of polymeric diphenylmethane diisocyanate and the use of brightened diphenylmethane diisocyanate in the production of polyurethane Nov. 30, 1999
5622259 Reduction of discoloration in plastic materials Apr. 22, 1997
5302259 Method and apparatus for altering the properties in light absorbing material Apr. 12, 1994
5171762 Process for improving the color of a polymer Dec. 15, 1992
5106605 Color restored radiation discolored salt compositons and methods for color restoration Apr. 21, 1992
4792341 Hair photobleaching Dec. 20, 1988
4676880 Photolysis of lactones Jun. 30, 1987
4289593 Method for increasing the ultra-violet light transmittance of ethylene glycol Sep. 15, 1981
4014769 Production of coformycin and intermediates therefor Mar. 29, 1977

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