Granted Patent
Utility
US 5,558,983 · App. 08/530,744
N-acyl-hydrazine compounds as contrast enhancers for black-and-white photothermographic and thermographic elements
Inventors:
Sharon M. Simpson, Lori S. Harring
Patented Case
View Patent ↗
Granted: Sep 24, 1996
Filed: Sep 19, 1995
Inventors
Sharon M. Simpson
Lori S. Harring
Assignee (at issue)
Minnesota Mining and Manufacturing Company
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.