Granted Patent
Utility
US 5,217,847 · App. 07/749,488
Liquid solder mask composition
Inventor:
Daniel F. Varnell
Patented Case
View Patent ↗
Granted: Jun 8, 1993
Filed: Aug 15, 1991
Inventor
Daniel F. Varnell
Assignee (at issue)
HERCULES LLC
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.