Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Optical brightener containing positive working color proofing system

Optical brightener containing positive working color proofing system

US Patent 4869993 · Granted Sep 26, 1989

Assignee

No assignee recorded.

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Integrated membrane and adsorption system for carbon dioxide removal from natura2013
Overbased metal carbonate/carboxylate microemulsions and halogen-containing poly2004
Process for obtaining a color image with improved resolution2000
Photosensitive elements and their process of use1999
Negative working, peel developable, single sheet color proofing system with poly1998
Composite black and white substrate for color proofing films1994
Composite black and white substrate for color proofing films1994
Positive working color proofing system comprising polyvinyl acetal/polyvinyl alc1990
Color filter array for liquid crystal display device1989
Positive working naphthoquinone diazide color proofing element with polyvinyl ac1988
Positive working naphthoquinone diazide color proofing transfer process1987
Di- and triphenylated cation radical polymers and their use as Diels-Alder catal1985