Granted Patent
Utility
US 5,545,507 · App. 08/530,694
Hydroxamic acid compounds as contrast enhancers for black-and-white photothermographic and thermographic elements
Inventors:
Sharon M. Simpson, Francis H. Sansbury
Patented Case
View Patent ↗
Granted: Aug 13, 1996
Filed: Sep 19, 1995
Inventors
Sharon M. Simpson
Francis H. Sansbury
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.