Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Pyrazolo(1,5-a)benzimidazole couplers

Pyrazolo(1,5-a)benzimidazole couplers

US Patent 5210209 · Granted May 11, 1993

Estimated economic value: $4,012,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Photographic element containing improved pyrazolotriazole coupler2006
Photographic elements containing a de-aggregating compound, dye-forming coupler 2005
Photographic elements containing novel yellow couplers2001
Color photographic elements containing yellow-colored magenta dye-forming maskin2000
Photographic element containing specific magenta coupler and anti-fading agent2000
Photographic elements containing 2-equivalent pyrazolone couplers and process fo2000
Silver halide photographic element comprising image dye-forming couplers2000
Color photographic elements containing yellow-colored magenta dye-forming maskin2000
Synthesis of yellow couplers1999
Pyrazolo 1,5 a benzimidazole photographic color couplers1999
Process for forming an image using novel magneta couplers for color photography1998
Phenol substituted pyrazolo 1, 5-a benzimidazole couplers1998