Granted Patent
Utility
US 6,248,890 · App. 09/178,956
Naphthalimide diester fluorescent tracers having improved solubility and fluorescence
Inventors:
Wayne R. Likavec, Thomas C. DiPietro
Patented Case
View Patent ↗
Granted: Jun 19, 2001
Filed: Oct 26, 1998
Inventors
Wayne R. Likavec
Thomas C. DiPietro
Assignee (at issue)
DAY-GLO COLOR CORP.
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.