Granted Patent
Utility
US 4,997,980 · App. 07/339,882
Ethanedioic acid hydrazide compounds suitable for use in high contrast photographic emulsions
Inventors:
Bruce M. Resnick, Allan Wexler
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: Apr 17, 1989
Inventors
Bruce M. Resnick
Allan Wexler
Assignee (at issue)
Anitec Image Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.