Granted Patent
Utility
US 4,018,940 · App. 05/634,719
Process for forming solder resistant photoresist coatings
Inventor:
Charles R. Morgan
Patented Case
View Patent ↗
Granted: Apr 19, 1977
Filed: Nov 24, 1975
Inventor
Charles R. Morgan
Assignee (at issue)
W. R. Grace & Co.
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.