Granted Patent
Utility
US 4,752,553 · App. 06/650,109
High resolution solder mask photopolymers for screen coating over circuit traces
Inventor:
Donald F. Sullivan
Patented Case
View Patent ↗
Granted: Jun 21, 1988
Filed: Sep 13, 1984
Inventor
Donald F. Sullivan
Assignee (at issue)
M&T Chemicals, Inc.
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.